Lets face it. If God were real why did cultures start off believing in many Gods? If they thought one creator made no sense. The only reason Monotheism came in to being is because it was viewed as more civilized, and structured as a belief. Not to mention it took how long for Monotheism to take over as a social norm? What about man prior to any religious beliefs? Are they all doomed to hell? Jesus, nor Muhammad have no text written that explains their beliefs to Neanderthals, or early cave men. Wouldn't God want to save them?
Didn't we eat from the tree of knowledge? How is that possible if we know that Neanderthals, and Cave Men roamed the earth so ignorantly. It took us how long to discover fire, and the wheel? Man was more concerned with survival back then, and not Jesus. Where was Jesus back then to reveal "truth" to these people that apparently God forgot to mention? Man evolved without God for a very long time, and I think it's safe to say that God is not real.