> If you are okay with a single universe coming to existence out of nothing you should be able to handle parallel universes as well just fine.

I can handle it, sure, and the idea of the multiverse is attractive to me from a philosophical standpoint.

But we have no evidence that there are any other universes out there, while we do have plenty of evidence that our own exists. Just because one of something exists, it doesn't automatically follow that there are others.