Is Islam Really a Religion of Peace?

I've been an atheist for the past five years (ex-Christian here). A bit of background: I read the entire Bible and started questioning God through science and the contradictions I found in the text. In my first year as an atheist, I remember sitting next to a girl who asked me about my religious beliefs. When I told her I was an atheist, she immediately switched seats and avoided me for the rest of the year. Honestly, I didn't care much.

In the second year, she started talking to me again, but she'd occasionally make snarky comments about my sexuality or other things. She was a Muslim and would also shame other Muslim women, all the while claiming that Islam is a religion of peace.

I'm curious, especially from ex-Muslims or those with credible knowledge about Islam: Is Islam truly a religion of peace? If yes, why? If not, why?

I’m genuinely looking to understand, so any thoughtful insights would be appreciated.

Edit 1: I see a lot of people mocking and asking me how I can't see that it's not a religion of peace. My question was whether the religion itself values peace, as I haven't read the Quran. I was also asking for credible sources in the comments to gain knowledge, not to defend Islam. Thank you to everyone who took the time to educate me. A special thanks to those who went the extra mile to list down sources and verses from the Quran.

Edit 2: I see people simply responding with "no," but I genuinely want to understand: Is your belief rooted in the Quran, Islamic history, or something else? This could greatly help atheists like me gain a deeper understanding and also encourage those who follow religion blindly to view things from a different perspective.