Why do people have faith that some type of "God" must have created the universe because the universe could not have "just happened?"

Why don't they take it one step further and ask themselves, "who created God?"

It seems they have a double standard. On one hand they believe the universe could not have "just happened," but on the other hand "God" COULD HAVE "just happened."

Evolution is change. The universe continuously changes, always has and always will. There was never a beginning and there will be no end. Saying there is a beginning and end is like saying space begins and ends. What, is there a wall with a sign at the "beginning and end" of space that reads, "this is the end?" Doesn't one have to ask themselves HOW there could possibly be a beginning and end to space?