I am indifferent to theoretical physics, which can't be tested.
If we don't know, then we don't know.
Theoretical physics can be tested. Some of it hasn't been tested yet. There may be specific theories that we are never able to test, but there are experiments going on every day and new angles for testing these theories are being thought of all the time.
There are some things that we don't know. There are other things that we do know.
And theoretical physics that can't (yet) be tested is usually referred to as hypotheses, which indicates that theoretical physicists are aware of the fact that they are not yet considered to be actual knowledge, but might be.
It's also important that even these hypotheses are deduced from what is already known and considered to be actual, tested knowledge about the world we live in.
The belief in gods isn't.