Most meditation, including TM is not a religious practice. It's about self awareness and allowing the mind/body to relax and rejuvenate. Such practices naturally have roots that are traced far back in history. Meditation is misunderstood in the Western world by those associating the practice closely with philosophical beliefs. Meditation frees the mind of thought, quite the opposite of philosophy/religion.
I was given a Mantra by the Maharishi Mahesh Yogi in 1968 (as I recall the year) in San Francisco.
I would assume you tried this one already?
James 5:14