CathInfo.com

I don't have any difficulty with the links and quotes you provided.

The following ideas were specifically condemned...

"III. Indifferentism, Latitudinarianism
   15. Every man is free to embrace and profess that religion which, guided by the light of reason, he shall consider true. -Allocution Maxima quidem, June 9, 1862; Damnatio Multiplices inter, June 10, 1851.
   16. Man may, in the observance of any religion whatever, find the way of eternal salvation, and arrive at eternal salvation. -Encyclical Qui pluribus, Nov. 9, 1846.
   17. Good hope at least is to be entertained of the eternal salvation of all those who are not at all in the true Church of Christ. -Encyclical Quanto conficiamur, Aug. 10, 1863.
   18. Protestantism is nothing more than another form of the same true Christian religion, in which form it is given to please God equally as in the Catholic Church. -Encyclical Noscitis, Dec. 8, 1849."

The doctrine of the Church also recognizes implicit baptism of desire. This consists in doing the will of God.

Archbishop Lefebvre

1. I am the LORD your God:
you shall not have
strange Gods before me.

Those outside the Catholic Church can be saved through invincible ignorance; not because they are following a false religion but in spite of it. Why did Christ come down to earth, endure His Passion and death on the cross and establish His own Church if all religions are vehicles of salvation? A Ford or Chevy can take you across the country but you need to take a rocket to get to the moon. In other matters there is a choice. In charting a flight to heaven, we have to play by God's rules, not our own.