What would you do if a being calling themselves God appeared and they took you to some sort of paradise and while there they showed you their love for you by showering you with love like you never felt before? Would you believe that they were God? And if you wouldn't believe why wouldn't you believe? Also would you believe if they performed miracles of any kind?
See, a foremost value in "teligion" is faith.
Believe despite all evidence, believe despite
no evidence.
The complete and total rejection of objectivity.
An atheist is one who takes note of the complete
lack of evidence for any of thr countless competing
versions of "god" and finds there is no more reason
to believe than in Atlantis.
We see clains for what "god" did (see flood) and find
they are bs.
Now, lets skip your scenario and say
I saw rock solid
evidence for Atlantis, or Batboy, or some god,
why then I would believe they exist.
You have your question backwards, really.
One of our posters said if he were convinced there'd
been no flood he probably would become an atheist.
Safe enough, as the chance that anything could possibly
shake fundy-faith must be near zero.
"Atheis" is not an ism, a religion or an ideology.
It is evidence based. Like disbelief in Batboy,
which we dont call aBatboyism.
Show us god or son of bat, and that will change.