Canon Law: Bouscaren and Ellis

Co-operation in Worship with Non-Catholics. It is illict for Catholics in any way to assist actively or take part in sacred worship of non-Catholics (c. 1258, § 2). Degrees and Kinds of Worship...1. Worship (cultus) in general means the manifestation of submission toward another in recognition of his excellence. It contains three acts: an act of the intellect recognizing the worthiness of the object of worship; an act of the will commanding submission because of that excellence; and an external act expressing the submission...the highest worship is due to God alone (cultus latriae) ...lowest and last listed is (cultus duliae) due to the saints and angels 1255, §1,2 . pg. 685, 688

A Practical Commentary on the Code of Canon Law: Woywod

A Person who of his own accord and knowingly helps in any manner to propagate heresy, or who communicates in sacred rites with heretics in violation of the prohibition of Canon 1258, incurs suspicion of heresy.
All Apostates from the Christian faith and each and every heretic or schismatic incur the following penalties: (1)ipso facto excommunication;.. Canon 2155; pg. 465, 467

An article of Catholic Faith needed to be believed by a necessity of means to be "Catholic," includes the The Nicean Creed (said on Sundays at Mass): "I believe in One God...and in one Lord, Jesus Christ, the only-begotten Son of God..."  

Benedict XIV: cuм Religiosi, ‘On Catechesis’--- “if was very often found that these people were ignorant of the mysteries of the faith, even of those matters which must be known by necessity of means…” pg. 45. St. Pius X: Acerbo nimis “we declare that a great number of those who are condemned to eternal punishment suffer that everlasting calamity because of ignorance of those mysteries of faith which must be known and believed in order to be numbered among the elect.” pg. 29.

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Cardinal Jean-Louis Tauran - President of PCID (Pontifical Council for Interreligious Dialogue).

Cardinal's Red Birretta - a symbol of a cardinal's dignity and willingness to shed blood for the increase of the Christian faith." The Pope places the biretta on his head and says, in part: "(This is) scarlet as a sign of the dignity of the cardinalate, signifying your readiness to act with courage, even to the shedding of your blood, for the increase of the Christian faith, for the peace and tranquillity of the people of God and for the freedom and growth of Holy Roman Church."  here

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I don't know about you; but I have grave concerns that the guy above would spill one drop of blood from a pin-pricked finger to defend the Catholic Doctrine; let alone "shed" blood for an increase of the Catholic Faith

The Delict of Heresy in it's Commission, Penalization, and Absolution: MacKenzie:

The Catholic Church claims to be, and is, the one and only true Church, established by Christ to perpetuate through all ages and among all races the truths which God has revealed. It is her duty to preserve and teach the deposit of faith; and corresponding to this duty is the obligation on the part of men to accept and believe the Word of God which the Church brings to them, and to profess their faith externally on suitable and necessary occasions. Canons 1322-1325 It is in light of this doctrine that the Code defines a heretic, in the following terms Canon 1325/2

Nostra Aetate "2"

2. From ancient times down to the present, there is found among various peoples a certain perception of that hidden power which hovers over the course of things and over the events of human history; at times some indeed have come to the recognition of a Supreme Being, or even of a Father. This perception and recognition penetrates their lives with a profound religious sense. Modernism -- Pascendi style....

Religions, however, that are bound up with an advanced culture have struggled to answer the same questions by means of more refined concepts and a more developed language. Thus in Hinduism, men contemplate the divine mystery and express it through an inexhaustible abundance of myths and through searching philosophical inquiry. They seek freedom from the anguish of our human condition either through ascetical practices or profound meditation or a flight to God with love and trust. Again, Buddhism, in its various forms, realizes the radical insufficiency of this changeable world; it teaches a way by which men, in a devout and confident spirit, may be able either to acquire the state of perfect liberation, or attain, by their own efforts or through higher help, supreme illumination. Likewise, other religions found everywhere try to counter the restlessness of the human heart, each in its own manner, by proposing "ways," comprising teachings, rules of life, and sacred rites. The Catholic Church rejects nothing that is true and holy in these religions. She regards with sincere reverence those ways of conduct and of life, those precepts and teachings which, though differing in many aspects from the ones she holds and sets forth, nonetheless often reflect a ray of that Truth which enlightens all men. Indeed, she proclaims, and ever must proclaim Christ "the way, the truth, and the life" (John 14:6), in whom men may find the fullness of religious life, in whom God has reconciled all things to Himself.(4)

The Church, therefore, exhorts her sons, that through dialogue and collaboration with the followers of other religions, carried out with prudence and love and in witness to the Christian faith and life, they recognize, preserve and promote the good things, spiritual and moral, as well as the socio-cultural values found among these men.

...as explained in part by Pascendi/ Van Noort

Pascendi dominici gregis

7. Vital Immanence...Religion, therefore, must be looked for in man, and since religion is a form of life, the explanation must certainly be found in the life of man. Hence the principle of religious immanence is formulated...it is due to a movement of the heart, which movement is called a sentiment.

Van Noort Vol 1: Dogmatic Theology

Immanentism teaches that the origin and deepest explanation of every religion and of all aspects of religion is to be found in man himself, namely, in the intrinsic disposition and desires of the human soul. pg. 11

Religion is individualized and becomes an inward negative vacuum based on one being his own arbiter using his own viewpoint, impression, or feelings. This act is the Modernist’s “faith” that forms the basis of their beliefs over time. A subjective foundation of religion; eliminating Scholastic approach and philosophy. This vital Immanence deceives one into following blindly their own attitude towards a religious doctrine in the assumption that their own impression comes from God; as opposed to a deception by the devil. The Rule of Faith is that their opinion is the final arbiter on matters pertaining to God and over the supreme teaching authority of the Church. Hence one can hold two contradictory concepts simultaneously, without any attempt to reconcile their overall belief system (Catholic Cardinal with a Hindu)

Pascendi

18. ...Hence in their books (Modernist), you find some things which might well be expressed by a Catholic, but in the next page you find other things which might have been dictated by a rationalist...

Pascendi

14. ....still this reality is not to be found but in the heart of the Believer, as being an object of sentiment and affirmation...If you ask on what foundation this assertion of the Believer rests, they answer: In the experience of the individual... Here it is well to note at once that, given this doctrine of experience united with the other doctrine of symbolism, every religion, even that of paganism, must be held to be true....Indeed Modernists do not deny but actually admit, some confusedly, others in the most open manner, that all religions are true.

Dogmatic Theology Van Noort Vol II

The rule of Faith: there are 2; the proximate and remote rule of Faith. The proximate rule of Faith is the preaching of the ecclesiastical magisterium (#27...the #27 footnote designates "Symbols" including the Nicene Creed/Apostles C. in which the Church teaching authority sums up the chief points of its preaching in view of needs of different ages). Remote Rule of Faith is the Word of God (handed down in writing or orally), pg. 122