Billions of world's seems true based on the calculations. Countless religions would be based on countless sentient species. That's less certain. We can't assume, even if there are, that they follow religions, though early species development perhaps suggests that might be true. Who knows -- maybe we are a slow species and other planets have beings that cast off religious nonsense much earlier than we have. It would be good to know, however.

We aren't alone but we might as well be. This "third rate planet" is all we've got. We're not a software program. We are here by random luck.