The Disingenuousness of Many Online Atheists. Why Do they So Often Employ this Tactic?

What upstanding gentlemen these two are (not)!
What upstanding gentlemen these two are (not)!
I was just blocked by an atheist for... simply disagreeing with him, I guess. I was going to post the following reply.
"Atheism is the disbelief in gods. Not the belief in the nonexistence of gods." - the atheist who blocked me
My response - "A distinction without a difference, for if you disbelieve in the existence of the gods, isn't that logically (and factually) equivalent to basically saying that the gods don't exist?
I've come across atheists who have made this point many times, and it's disingenuous, it shows the lengths to which they will go simply in order to "win" the argument.
By the way, I don't believe in the gods either, because I just don't think they're real, that they actually exist. I am, however, open to the possibility, however remote that may be, of being wrong about this. So many insist on God's existence, and if they turn out to be correct after all, then I will have to admit to having been wrong about this, and change my mind."
The Disingenuousness of Many Online Atheists. Why Do they So Often Employ this Tactic?
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