Pettitte engaged in a criminal act to gain an unfair advantage in his profession. That is cheating. It is not at all like smoking pot. It is more like insider trading. It is indisputable that he is a liar. He completely changed his story depending on the venue and the evidence. Because he lied on numerous occasions anything else he says on the issue has little credibility.
I couldn't give a rats ass about his religiosity. I don't count it in his favor or hold it against him. He is a hypocrite nevertheless. The whole act about wanting to be near his family because he was missing precious years with his kids was exposed as complete hypocrisy when he returned to the skanks. His lies and deceit are not limited to PEDs, so he has no integrity.
Lastly, he is a despicable rat who turned on his best friend. He was okay with lying to protect himself and his reputation, but the minute he got caught, he flipped on his best friend and mentor. Even then he wasn't truthful. He gave the investigators just enough in an affidavit to get them off his back and put the heat on Clemens. He opted to do an affidavit, because he was too gutless to testify in open session with Clemens present. That was cowardly. Because he is incapable of telling the whole truth, his affidavit was completely watered down, and it did not hold up in Clemen's case. I believe that later he claimed that he could not remember.
Let's add to the list of his attributes that he is a rat and a coward. Summing up, he is a lying cheating hypocrite criminal cowardly rat. That is not my opinion. It is all established by facts. A man with all of these bad qualities is a man of low character and untrustworthy. He may not be a murderer, but he is a despicable person.