Believing in creationism is a sin

[Joel]

Creationist claims are scientific claims because they have effect on the natural world. They can be proven and disproven.
It's a theory in the sense that it's an idea. It is not a theory in the sense of 'the theory of gravity'
I'm sure you know (I really hope you do) that there are two different meanings - when laymen use the word - and when scientists use it to describe a scientific theory - which is very different.

Creationism isn't - and can't currently be - a scientific theory, because it has no supporting evidence.