Is Science everything?

Hmm...

that leads me to a very perplexing question:
What if God appears to Humankind and tells us some random statement, such as He is the only God?

Would that have to be proven as well?

Yes, that will also prove that God himself exist, by introducing himself. He hasn't done that since.... well the beginning of written history so the chance of him actually doing that? After all the very veil of mystery to his existence brings hopes to some yet curiosity to others and even condemnations among some.

Otherwise, the only other method of proving whether god exists is through a logical process, so perhaps science is the way to do so if it could.