That is probably the question that the first century Jews asked or the first century Christians: "If you follow the Torah (Old Testament) as you claim, why do you need the teachings of this Jesus person?
I am a Mormon, and a graduate student specializing in the history of American Religions. I assure you that after reading over 75 Books this past year about all sorts of religions, I have, indeed "taken time to find out." I have found things to respect and applaud among all the religions. I have also been strengthened in my faith in Jesus Christ, The Bible and the Book of Mormon which is a powerful second witness of Christ.