I will prove to you that God exists

[Sheldon]

I keep explaining this is an argumentum ad ignorantiam fallacy, yet you keep using it? 

On another forum, I pointed out a fallacy in one of his replies.  His response was to suggest that he could find fallacies in my posts, too.  I think rhetoric is a more telling master for him than logic.

Yes, it's hard to debate the "nu uh, you are" argument for sure. You have to see the irony though, when his fallacious argument is pointed out, he resorts to whataboutism, which is also fallacious, and is considered to be a form of the tu quoque fallacy. 

I don't mind that someone is unware their argument is irrational, or that they make an error, as we are all capable of this. What irks, is when they ignore the fact, and then go on to dishonestly repeat the argument. Often moving from forum to forum to do this, which is pretty compelling evidence they think they can bluff others, when they have failed elsewhere. 

Lies for Jesus, is a pretty common tactic unfortunately among many apologists. The rationale seems to be that it's ok to lie, if it brings someone to their religion.