Evidence is the path to follow.
Otherwise, murder cases would be solved by finding someones belongings near the scene of a crime.
They aren't?
As for Einstein being a father of QM- that is not being debated. His findings helped form our current understandings of it. BUT- Relativity is almost entirely attributed to him, and has only been tweaked minorly since then by others.
Have you ever heard of Galileo? He actually invented relativity. Why do you think that that Einstein didn't get the Nobel prize for Relativity?