####Parallel universes is scientific speculation, though I doubt very seriously if most scientists would think it should be discussed in a classroom. The Designer is a theological speculation.####
How is discussion of a parallel universe scientific if it such a universe can't be observed, measured, falsified, etc., by the standards you fellows have set up for science to follow?
Personally, I don't think much time should be spent on discussing parallel universes, but it wouldn't bother me if they were discussed a little. Nor do I think much time needs to be spent on discussing a possible designer, but I see no reason to forbid it.