He explained a common thread he found among religions like this:
Each tradition records that if we gently though persistently look into our own experience, we will ultimately discover that who "we" are is not different or separate from that which we call God, Cosmic Consciousness, Unbounded Wholeness, the Tao, Nirvana, and countless other names (for this ultimately unnameable experience). The common thread of experience found at the core of every major spiritual tradition is suggested in the following statements:The Kingdom of Heaven is within you. -- JesusLook within, thou are the Buddha. -- Buddha
Atman (the essence of the individual) and Brahman (the essence of ultimate reality are one. -- from the Hindu tradition
He who knows himself knows his Lord. -- Muhammed
His voice comes across as dry at times, but it's generally an enjoyable read. His assertions are strong but with research to back them up, I found them believable. I recommend this book.
Read more about this book at Amazon.com.