I agree with a lot of what you wrote. However, water birth is actual physical birth in which the mother's water breaks, that is the physical. One has to exist first. Then they must be born a second time, given birth by the Holy Spirit - which is not "belief" as you indicated but simply person of the Holy Spirit. (Where you got that idea from, I have no clue.) What is flesh is flesh and what is spirit is spirit We have to be born of our mothers to see the natural world.,and the physical cannot see the spiritual world. Only by being born that second time can we see the supernatural world. That's how I have come to see it, anyways.