prove religion is not holding us back.
Prove that it is.
prove there is a god.
checkmate!
Prove there isn't.
See the problem is that He tried proving His existence already. During the time of Abraham, he and Abraham as well as Abe's kids apparently, were on first person speaking terms. But what that gave him were mindless followers who would do whatever he asked. He doesn't really need these as He already has the Angels, powerful servants who nevertheless remain soulless. What separates Humanity from Angels is the presence of a Soul. He doesn't want more mindless followers, He wants companionship who can interact with Him on His level. The entirety of the Old and New Testaments is both the story of God's Chosen people the Jews, but it's also the story of God trying over and over to find a way to purify Man of they're sin so they can approach Him, because as a perfect being, he cannot abide imperfection to be in his presence. It's not that he doesn't love and care for each of His creations, it's just that His perfection burns away the imperfect, IE sin, and until a man's soul has been purified, that soul, that part that can interact with God at his level down the Centuries would be burned away as well. Hence all the goings on first with blood sacrifice then the sacrifice of His only Son to one of the most barbaric death immaginable.
Sorry I get a bit long winded.
The problem with a strong Church is that you get people up at the top that get corrupted by the power they wield. The problem with strong government is you get people at the top that get corrupted by the power they wield. It's not that religion is bad, it's the people that are inherently bad.
Same thing can be said for scientists who manipulate the way the information is reported to make sure they get an outcome that keeps they're research going. The myth of the Dreamer who goes into science to find a cure for something and keeps they're dream is sadly just a myth.
Lastly, a foundation of strong science and reason hardly discounts the existence of the Divine.