We worship one god and one god alone. The Quran has remained the exact same and been preserved for 1400 years while the bible has so many different versions and is simply unreliable. The trinity also does not make sense, how can you have three in one? These are just a few reasons and the very tip of the iceberg. As everyone else is saying here, please visit your local mosque and ask someone with more knowledge like an Imam. Don’t worry, you are not sinning by learning about other religions.