[sdtPikachu]

"God can only be proven when he comes back"

Well if we are to use your rather stringent definitions of what constitutes proof or evidence on a scientific basis, even god coming back wouldn't prove he existed.
Is it really a supernatural force?
Is it not just a guy from the future having fun with a randiom planet, using all kinds of futurisitc machines to make us think he's a god?
Could it be aliens maybe, doing the same type of thing?
Could it all just be a figment of my imagination?

All of these are possible, and by the standards you apply to sceintific regimes just as provable as god is. Hence:

"... and even if that happens, I'm sure people still won't belive it"

"They will have to find some scienific evidence that the disappearances were acctually caused by god."

And what's wrong with that? What is wrong with questioning everything? Knowledge can't kill anything apart from igonorance and misunderstanding. There is nothing wrong with wanting to figure out how the universe works. IMO, god is the overly simple and wrong explanation for everything I have ever seen in my life.

"So, in conclusion, I doubt this arguement will go anywhere, it was fun while it lasted"

Well in that case, I hope you've come to some understanding of how my/our mind(s) work(s)... otherwise, this carpal tunnel syndrome was all for nothing...