I haven't seen the issue of water addressed in a convincing manner yet. Those who adhere to the Global Flood myth, please address this if you would. I don't even care to address the question of where it came from but when the flood waters receded, where did they go? The latest figures I have heard that would be required to inundate the entire world and submerge the continents is about 5 times the current global supplies including icecaps, glaciers, subterranean, oceans, lakes, and atmospheric water vapor.
I think this is a valid question and not off topic since the OP is not really a very coherently stated and narrow subject. I don't think the idea of a global flood is possible without addressing this one glaring problem.
"I refuse to prove that I exist," says God, "for proof denies faith, and without faith I am nothing."
"But," says Man, "the Babel fish is a dead giveaway isn't it? It could not have evolved by chance. It proves that You exist, and so therefore, by Your own arguments, You don't. Q.E.D."
"Oh dear," says God, "I hadn't thought of that," and promptly vanishes in a puff of logic.
"Oh, that was easy," says Man, and for an encore goes on to prove that black is white and gets himself killed on the next zebra crossing.