So your thesis is that since different people had varying ideas and/or theories about the killing of John F Kennedy, he didnt exist? Or since you might bring in an argument without understanding this analogy, different people have varying perspectives about some figure in history, he doesnt exist.
Any thing that has different concepts about it doesn't exist??
Im sorry but arguments for atheism are drowning these days. With all the education, technological advances, communication etc, it keeps drowning further.
If miracles indeed happen in every religion and theology as you say, either all of them are bogus, some of them are bogus, or all of them are true. Two of these options means there is something other than the natural world out there. It doesnt prove God doesnt exist. It just proves somethings out there. If all of the miracles are bogus, it proves people are bogus. Doesnt prove anything about God.
People having different beliefs either prove they are all bogus, or some of them are bogus, but not that all of them are absolutely correct. Worst case scenario, if all of them are bogus, it still does not prove anything about God.
The God, could still exist.
This is a false argument.