[Aloysius]

fullness of truth resides in Christianity.

By Chritianity to you mean Catholicism? Non-Catholics don't have the fullness of the truth.

[american colleen]

I know that (you've probably read down a few posts since you posted this) but since I was talking to a non-C, I didn't want to widen the debate. Plus, at the time Mohammed has his "revelations," Christianity and Catholicism were one and the same...

[fishtank]

Any born again eliever in Jesus is part of the Body of Christ.

Please don't confuse the confused old fools in the Vatican as the only guarantors and guardians of Truth. I did that at one time in my life and I ended up severely mistaken in my confidence placed in the Vatican.

No pope is or ever was infallible. You can read about one of the first instances of papal infallibility in the bookof Galatians where the apostle Paul had to correct Peter about the false doctrine that Peter was proposing.