Get it right:
Science is religion because it has as much nonsense in it as any other religion. This is evident by the fact that the religions wouldn't exist if they had nonsense in them.
Scientific theories confirmed by observations or physical evidence are pretty solid. As close to a fact as you can get.
You are probably thinking about scientific theories that have not been confirmed by observations or physical evidence yet and you are calling them nonsense.
Usually these unconfirmed theories are based on a little more than sentences someone wrote in a book.
Religions on the other hand have some wild, supernatural claims, and flat out false information (6000 year old Earth, virgin conception, winged horses and 6 day creation comes to mind)
Then there is Big Bang, of course. Using a bare minimum of mathematical theorems, BB attempts to show how the universe came about from a big explosion. Yet it depends on other theory and ideas to explain how the complexity that we have in the universe could ever come about through an explosion.
Marvel Avengers movies do a better job of explaining the universe than BB.