You can just say you don't have an evidentiary threshold. No one is going to hold it against you. It just means no one will want to engage with you because you're implicitly admitting that you didn't reason your way into your position so there's no way to reason you out of one.
I've had enough of the "prove god doesn't exist" discussions with fanatics over the years to know where this is going, but since I'm bored on a flight I'll indulge you. A random galaxy formed billions of years ago, how was that political?