Hello! I might be on the way to becoming Jewish and currently Muslim have a few questions.

Did Jews really write the Quran and thoughts on Muhammad? Heard some things about the disjointed letters.

Can a gentile become Jewish or do you need to have heritage?

Can you guys pray for me?

If I become Jewish can I still use Quran for praying? Only some portions I’ve learned Arabic already kind of. TYVM for your replies.