"Theistic evolution is a theory such as evolution and the big bang. They are all theories in the big picture."
Theistic evolution in one sense is a theory, you're right. However, what 'theory' usually means in the scientific field is 'a non-falsified, repeatable test that confirms a hypothesis' (a loose definition). Given that, evolution is not a 'theory' in the colloquial sense (i.e., a proposed idea); it is a repeatable experiment that confirms a hypothesis.
But just to complicate things a little more, the naturalist philosopher (archaic term for 'scientist'), David Hume, put forward a revolutionary principle that states that an unrestricted general conclusion cannot be the basis for all concluding knowledge on an item of study and experimentation. Which is to say that once you know something from repeated experimentation, that doesn't guarantee that you will arrive at the same conclusion through the same experiment in all circumstances. And as we know from quantum physics and the Uncertainty Principle, testing often biases the results at an elemental level because all measurement interferes with what's being measured. Hence nothing is known with absolute certainty.
At first glance this would seem to agree with your sentiment that "they are all theories in the big picture", but in admitting this it places you squarely in the position of not being able to defend decisive conclusions like, "There are no experiments that we as mere mortals can do to prove or illustrate points of creationism." For if the zero-point is that right belief depends on "the amount of weight you personally put on the given evidence" then we can reliably suggest that more mathematical proofs, such as Kalam's Cosmological Argument, terminate the opportunity to disbelieve: determine a point that doesn't exist, disambiguate an actual nothing, count to one (with all infinite variables between nothing and one).
The point is that science, Scripture, logic, math all assume a starting point for what is based on the fact that something is. Denial of that is absurd. Thus, we can determine an actual point where something had to have been 'created' or somehow initiated into being; it is scientifically and logically impossible to believe otherwise.
With that in mind, we can now calmly disagree together with your original statement that "The only proof of creationism is the bible, that I am aware of. There are no experiments that we as mere mortals can do to prove or illustrate points of creationism."
Anticipating your reply.