Shrugs, There are lots of things we don't know, that doesn't mean you wedge God in when we don't know something because eventually we probably will know that thing and then God is pushed back again.

https://en.wikipedia.org/wiki/God_of_the_gaps

I personally don't believe in God nor do I have any objection to other people believing in god except where they think their belief gives them special powers to influence things beyond 'one person, one say' then I get annoyed - fortunately I live in a largely secular country (and becoming more so) so it's not an issue I run into with much regularity.

Religion is a representation of man’s yearning to answer “why?”. Some questions don’t have answers and that’s okay. Having faith in the process of learning we realize that answers can be derived through logic and fact. God is a concept variable to represent the answer to that question for those who haven’t realized the purpose of such a concept. As such, time passes, more mysteries are unfolded, and there is less need for mystical thought.