I couldn't be entirely sure, but whilst it can be proven that many supposed religious beliefs/experiences are down to science rather than divine power, science has not yet proven the absolute non-existence of God. I think, even if it does, believers will not accept non-existence, as they will hold that God is above science and its existence can only be proven by faith, and science's failure thus far to prove God's non-existence is proof that it does exist.
I think.