Guy Threepwood
Mighty Pirate
Some of the early proponents of multiple universes (think Reformation era) were religious. There is nothing about the concept that is inherently atheistic.
As above, touting a multiverse's imaginary capacity to account for reality without ID,- a great lotto tumbler- is inherently atheistic- and that's exactly what it's primary proponents and most adherents do.
I take your point as a technicality, but on a Venn diagram- don't you think there'd be a pretty distinct overlap?!