The problem with your argument is that when you find a counterfeit, that only proves that something real exists from which to copy.
You will NEVER find a counterfeit $6.00 bill or $9.00 bill! The only currency that is ever counterfeited is that for which a real exists.
I'm not familiar with the incident to which you refer, but if it IS true, then that man will be held accountable by God, and will be judged accordingly.
But if YOU judge, then you cannot point your finger at Christians when they say that certain atheists' behavior patterns are wrong, and accuse THEM of being judgmental.
Judging and accusing others of judging are two-edged swords which the users cannot afford to swing lest they cut off their own legs!
But remember, "He who is without sin may cast the first stone", and don't you DARE say that doesn't apply to you just because you aren't a Christian, because then you're setting up a double-standard, which is hypocrisy, which is what you're accusing Sam of doing. Judging another only condemns yourself!
Don't demand of others what you, yourself, aren't willing to give! You want perfection in someone who labels themselves as "Christian"? Then BE PERFECT before you condemn another of not being perfect.
The fact that you know enough to point out the hypocrisy only proves that you know right from wrong, and you cannot use any excuses for the wrong behavior YOU carry out!