Learning About Islam for Marriage

Assalamu alaikum! I’m a 24-year-old woman, not religious before, and I’ve been married to a 23-year-old Muslim man for two years now-we live together. He knows I didn’t follow any faith when we got married, and he’s always said he’s working on himself too, praying and seeking forgiveness for any mistakes. Lately, he’s been talking about renewing our commitment properly in an Islamic way and asked me to learn about Islam. I’m open-hearted and really want to make this work, so I said yes. He got me a Quran, and I’ve been reading and watching videos, but some things are hard to grasp. I agree that God isn’t a human, so I don’t see Jesus as divine. But I’m stuck on why Islam is the truth as the Quran presents it. I believe in a loving, merciful Creator who made everything. However, from what I’ve read, it seems Allah’s mercy is mainly for Muslims who follow the prophets and worship Him, while non-believers might face hell. That’s tough for me because I feel a truly merciful God would care for everyone, not just one group. My husband says if I can’t see God as merciful, I can’t really embrace Islam. I’m trying to find the signs or path that show Islam is true, but I’m a bit lost. Sorry if this is messy-I’m just confused and seeking clarity. Any advice or personal insights would be so helpful, jazakallahu khairan!