I'm struggling with some deep questions about existence and Islam-can anyone help?

Assalamu alaikum, everyone. I'm a Muslim trying to genuinely understand my faith, not just follow it because I was born into it. I've been wrestling with some big thoughts about existence. If there's no God, just science-like the Big Bang and evolution-I still get stuck on where everything originally came from. Why is there something instead of nothing? How did life first begin? It seems like nothing existing would make more sense, you know? So I start thinking maybe religion has the answer. But then Islam gives me its own questions. If Allah knows everything I'll do and my final destination, what's the point of free will and judgment? I want to see Islam as a moral guide-don't mess up your life or others'-but I need to understand it, not just accept it out of fear. When I take God out of the picture, I'm left with even more questions. Can anyone offer insight?