There's no doubt the cosmologists understand the math and physics of the hot big bang better than the Pope and the archbishops.Only that the scientists who got there the hard way may have a better understanding than the true believer.
I only stated that Christianity and Judaism claimed there was a beginning to the universe. The scientists of the young Einstein's day generally thought that was incorrect.
An interesting sidebar is that the person who first discovered the universe was expanding, and extrapolated it back to an origin point was a Belgian Catholic priest.