Except it's not the one you have believed in all your life, or one who you've denied the existence of in favor of facts and science. It's there, it's shown itself to the world and has given undeniable proof of it being the real deal, and so you're left to wonder...
What exactly do you do now?
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Whatever I'm expected to do in that circumstance. Since any plausible God either loves the way the world works, or is disgusting immoral mess for allowing the world to operate against his wishes, I would probably not change much.