I’m confused

I grew up not really religious but believed in god and Jesus Christ, I’ve started reading the Quran and this religion has been calling to me for about two years now, I just don’t understand how there is only one high power from both books and only one of them is right, I don’t want to go crazy abot this but it’s just so confusing knowing it is different religions with different higher powers and only one of them can be the right one, should I start practicing the religion that is calling out to me or how do I go about this after being a believer in Jesus Christ for 20 years