The much humanity can go is the awareness that there are existence of forces, so that in your consciousness there is one God. The feeling, bringing human imagination(spirit/unseen by others, except those that can flow) to the world is a prove that other beings exist and it is just within matters the actual composition of human.
Proving the existence of God means going beyond human nature which is impossible. Awareness of God existence is how much human can go. Proving his existence is beyond our reach.
I'm not a follower of any religion, but I accidentally always have feelings for many different religions. As I understand it, and I also understand that everyone tries to limit God to someone, a divine being with supernatural power who creates everything and is forced to stay within a limited form, and the view that I can break it down right away because it's completely confused, so who created God? Maybe the crowd doesn't know that, God has no limitations, and we are also part of God, that's why I also understand that Jesus describes God the Father as being within us.
Current science is indeed very admirable, but perhaps they are not capable enough to explain all their own questions. It's like a newborn baby being unable to understand trigonometric problems, and that's also how people today show that their understanding is always superior. There is another thing that I also see a bit of similarity in the 11D state, if someone could feel what those 11D are like, they would no longer oppose/doubt God, but anyway Individuals need time to experience and complete each of their missions in life.