I had someone say that to me the other day, I said a version of that plus something like "Out of the 30,000 known gods and goddesses throughout history, what if any of the others were right? What if Islam, Judaism, worship of Thor, Odin, Ra, Jupiter, Zoroaster, Mithra, Ebisu or ANY others is the one you should have been worshiping or, what if you DID get the right god but the wrong sect? There are over 30000 of those around today and hundreds of others that are barely known to historians? You're asking me to bet how I live my entire life on those odds? On the odds that you, out of all of history, have figured out the right god, the right way to worship with the right rituals?