I've heard a number of people from different Christian religions question the practice of Catholics in performing the sign off the cross. They say that this is not mentioned in the bible so why do you need to perform such a sign? Other go as far as saying that the sign off the cross is the sign of the devil. They say that Catholics have deviated greatly from the teachings of the bible. Being a catholic, how would you defend the sign off the cross? Do you still believe in the holy Trinity which is why you perform such sign?