The historical sciences like evolution and the big bang theory are highly speculative in nature.
I think I believe in a combination of Creationism, and evolution though not on the same level. Humans evolve, look how much taller, and healthier we are today as opposed to 200 years ago. We are losing our hair, and our muscle structure.
The Big Bang theory always worked well with creationism for me. I can see God somewhere dropping a big firecracker into the nothingness! Waiting for the earth to cool, and the start adding things.
Also with all the stars out there, there have to be a lot of Earth like planets around.
They aren’t “science”, they’re conjecture.
As you said, “speculative”.
No control, no repeatability, no falsifying conditions provided, etc.