From a scientists pov...
We don't know the ultimate origin of the universe.
So. Form your hypothesis.
The universe could have been created by "God", or some higher power.
test your hypothesis.
There is nothing that proves this hypothesis is incorrect.
Conclusion. God, or some higher power, is as likely as any other explanation.
Until you can prove my hypothesis is incorrect, it is as valid as any other belief.
And that is how scientists can believe in God. Quite apart from the fact that the simple beauty of science is enough to give you faith.
A scientist would not "file something as unknown". The premise of being a scientist is you seek answers. If every scientist just thought something was unknown and didn't stretch their mind to an explanation, then nothing would be discovered.
We don't know if the earth is round or flat. Ok, let's file it under Unknown.
No, they proved the world wasn't flat.