The absence of 100% proof against something, that is by nature beyond our proving, is not a good argument for its existence.
It’s impossible to prove that Javorkabawn–a God I just made up–doesn’t exist, but you won’t see me arguing for his/her existence.
When we believe that something exists, we should have reasons for it. I believe sharks exist because I’ve seen them, and so has everyone else I know, and civilisation has documented for a long time sharks existence with actual proofs, things like, shark skeletons, or actual bites on humans from sharks, etc. The burden is not on me to disprove that something that there are very few good reasons to believe in exists, but on you to prove why something there are very few good reasons to believe in exists.