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.
What has been proven is that the early universe was much, much smaller, and that the universe is expanding. The further away from Earth the object is the faster it moves away. The pulling (Dark Energy) and pushing (Dark Matter and ordinary matter) tug of war is going on everywhere in the universe. In our backyard, the Dark Matter is winning so we are ok for now.
You want to hear and see the remnant signals of the Big Bang, turn on your TV and switch to an OTA channel with no programming.
What has not been observed is the actual beginning of the Big Bang.
There are some theories that say that our universe came about from a singularity of a black hole somewhere in another universe. But they have not been confirmed by evidence.
Except that nobody has proven that BB existed. But if they somehow do, all that they will be proving is that BB is God, and that it was God that created everything.
Back to religion again.