In this book, Mikael Stenmark identifies and explores several prominent religious and secular worldviews that people in contemporary society hold. Three nonreligious worldviews are highlighted: scientism, secular humanism, and transhumanism. These are contrasted with four religious worldviews: Abrahamic theism, Buddhism, the new spirituality (the so-called 'spiritual but not religious' individuals, SBNR), and religious naturalism. Some challenges facing each of these worldviews are discussed toward the end of each chapter. The book offers a unique study of several key secular outlooks on life that go far beyond previous studies of atheism, nonreligion, and religious 'nones.' It also provides a rare insight into the beliefs, values, and attitudes that secular and religious thinkers consider essential to our identity and place in the world, as well as what we should deeply care about in life.