I sure as hell (no pun intended) wouldn't start playing roulette with religions hoping the right number came up. If there was no way to know which religion it was, then I simply wouldn't pick one. If there was a god, there's nothing that says he has to be one that's described in any of the major religions. There might one guy named Steve in Mozambique who has the only accurate picture of what god expects from us. Or there might be no one who has an accurate picture and every living person could be going to hell. Or the true god might be like "i don't know what this hell thing is.... after you guys die you're consumed by the earth and cease to exist, just like all the other animals."
I already live my life in a way that i'm proud of, and happens to be in agreement with how the major religions say I should act. If god has a major problem with me because I didn't guess right what religion he wanted me to be and sing enough songs to him, then I couldn't care less.