islam? which religion?

I've been Christian all my life—not necessarily a devout one—but I come from a family of Latin Christians who hold strong beliefs in the Bible. However, I've been questioning the integrity of the Trinity and religions overall. I’m unsure which is true and which is right. I have individuals in my life who are Muslim and who i care for deeply speak to me about their faith, and I also have Christians who insist their religion is correct. I own both holy books (which I know might not be well-received in either religion), but I have them because I’ve been studying both.

I guess what I’m asking is: how can I know if Islam is the true and ‘right’ religion?