But they do not suddenly exist because the evidence is there. They are pre-existent.
The actual fact of something existing has nothing to do with us.
What we are talking about is the rational belief that things do exist, and for that you need evidence. You could still be wrong though and think something does exist when it does not, but only more evidence can change your mind.
So, either a god exists, or it does not. They are the ONLY two possibilities.
By default we do NOT accept the existence of a god, as the default is to not exist.
YOU believe a god exists, therefore YOU carry the burden of proof.
Do you agree?