I agree, they are just theories. They evolve and adapt or get thrown out if they don’t stand up to scrutiny.
I don’t think science has an agenda as such, it’s just a method of trying to understand the universe in a way that can be tested and agreed upon.
As for dinosaurs, you’re never going to get proof it one in the flesh, because they don’t exist anymore (other than crocs etc) so fossil records are the best evidence we have that they did exist. Sure there’s some creative license in what colour they actually were etc. But I think that’s illustrative rather than anything else.
As for religion. I think faith is a great thing for helping people to understand their place in the world, their connection to the planet and the other people on it, and their purpose of being here. I don’t actually think it does a great job of explaining how everything was conceived and came into being. Science hasn’t got the answers either, but it works to try and understand that, and readily admits that currently it can’t.