Faith is very personal and subjective, however, the First Commandment isn't; Traditional translation (this example Aryeh Kaplan) is as follows: (20:3) "Do not have any gods before Me. Do not represent (such gods) by any carved statue or picture or anything in the heaven above or the earth below or in the water below the land. Do not bow down to or worship them." Goodness, there seems to be a major violation of this commandment within the Catholic Church. Y'know, the holy trinity stuff ... Two points.
First, Catholics treat Mary as sacred and not as a diety.
Second, when any person of any religion or any sect of a religion worships a god, it is impossible prove why their believe in their god is less deserving of respect than your belief in your god.
Look up the words "faith", "proof", and "respect".