You should find out for yourself! He has written many books and has a very influential podcast (my opinion). Here's the wiki:

Samuel Harris is an American philosopher, neuroscientist, author, and podcast host. His work touches on a range of topics, including rationality, religion, ethics, free will, neuroscience, meditation, psychedelics, philosophy of mind, politics, terrorism, and artificial intelligence. Harris came to prominence for his criticism of religion, and Islam in particular, and is known as one of the "Four Horsemen" of New Atheism, along with Richard Dawkins, Christopher Hitchens, and Daniel Dennett.

Although after a recent interview which resulted in memes and click-bait headlines taking things out of context, he is now the whipping boy of the right. On the other hand he equally (if not more) criticizes the left, resulting him to be targeted by people who align there also. He's an easy target for online trolls and those who want to earn internet points fairly easily without critical thought.