I know imagination is not reality but it is there where ideas form. W/o it, well, I don't think we would have made it this far.
Everything you've said thus far, IMHO, does in fact support this statement--everything except your god belief. Imagining a better world through inventions, then acting on them, is not the same as imagining an invisible sky daddy, and it being true.
Imagination is required to make things happen, but it's not the only thing.