Like all 'man made teaching' groups, it doesn't matter the flavor, their teachings are based in satan who is the prideful one - who always wanted to be like God. So he has his own words to counter God's Word for the masses and now has his little pawns who are deceived from the 'great deceiver'. Pity a man who corrupts another man - who is searching for truth - and they teach them 'man made teachings' which are 'the lie' of satan.
For there is only one Truth, Jesus The Word. Jesus is THE Way, THE Truth, THE Life. Jesus is THE Way to The Father and Jesus is ETERNAL LIFE. 'Man made teachings void eternal life because JESUS is IT. Hearing and obeying 'man made teachings' - they follow man and not God - which leads to the road of destruction.
Catholics ARE Christians, unless you are saying that I do not believe in Jesus.
May the Peace of Christ be upon you.