ToE is a theory, it is no way you or other scientists can 100% prove or disprove ToE, just as a religious belief is just that, a belief.
No.
Scientific theories are not just mere beliefs.
They are bodies of knowledge that explain sets of facts within well defined scopes, which make testable predictions and which are falsifiable.
Scientific theories can not be proven, true. But they
can be disproven.
To quote Krauss:
Science isn't in the business of proving things. It rather is in the business of disproving things.
When you devise a bunch of tests for a theory, then
- successful testing would mean that the test
supports the theory (not "prove"!)
- failure would disprove the theory (assuming no issues with the test itself or with the prediction being tested)
For example, a physics theory predicts that a hammer and a feather will fall to earth at the same speed when dropped in a vaccuum.
So you can devise a test that does just that and observe the falling rate.
If they fall at the same rate, then that result
supports the theory (not "prove"!).
If they do NOT fall at the same rate, then the theory that makes the predictions has been falsified. Aka, disproven. It's wrong. False. Inaccurate. Dismissed. Game over.