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 Cornelius was justified by Baptism of Desire. .

Concerning the baptism of Cornelius. Acts 10&11

Cornelius is as far removed from the Church as any non-Christian will ever be. He was separated geographically by a dangerous multiple day journey, he had no knowledge of the Catholic church or anyone who could lead him to the truth, and worse of all, St. Peter probably would not converse with him much less enter his home or initiate him into the church as St. Peter (and consequently the Church following Peter’s direction) would consider that “casting pearls before swine.” Cornelius was a religious man who had a fear of the Lord, which is the beginning of faith; he practiced natural virtue and was given grace from God including the gift of tongues as an external manifestation to Peter of God’s grace in Cornelius. Cornelius cooperated with the prevenient grace of God and moved his will to do what was necessary for his salvation. Miracles ensued which led to his evangelization and baptism. The obvious lesson from this story, believed by the early church, is that the Church is universal, but also learned here is that physical circuмstances cannot impede Divine Providence or interdict the necessity of the sacrament of baptism.

Also, where exactly does it say that Cornelius was justified before his Baptism?

You know, as this topic never dies, and as it seems that the same people debate it, it's crazy that nothing ever gets resolved.  I really wish we could setup a thread for an individual person (i.e. a pro-BOD person) and let him debate/converse/ask questions of all the "Feeneyites" on this site.  If there was a way to do that, then truth might be gotten to and time saved.  As it is, you have 5 conversations going on at once and no one is forced/reminded to stay on topic.  It's total chaos and it just repeats ever 90 days or so.
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If anyone wants to debate/converse one-on-one, send me a PM.

A major problem is that the BODers do not answer questions, rather, they completely ignore direct challenges as they continue to quote the same saints and catechisms. If they did meet the challenges, answer questions and were honest, they could not remain BODers.

That is the key here I think Pax, they will only believe what they want to believe no matter what, why else do they ignore questions and run from any challenge? It is because they refuse to believe what they do not want to believe.