God's creation does not only include biologic forms on the dimension that we exist - think about it - he made the demons and the angels (actually, demons were angels - they just went full anarchy). The other dimensional beings are not all demons, although I do not know that we are aware of them like we are of demons. I believe that the vastness and diversity of what the creator has done will be beyond anyone's comprehension - his nature is to create, and he does not have limits like we do, or like our pea brains do.

I agree that there is plenty of advanced craft out there and has been for a long time, created by humans, with technologies of various origins - the Naval Air Force uses some of these technologies to explore out there beyond what we know of - they can go faster and farther than the puny rockets we are shown when a space shuttle heads into orbit - that's like a Lego toy compared to the REAL stuff.

Just my opinion from all I've learned on so many aspects of these topics, and I like to think big.