Because of the sort of books I read, I keep coming across these words and have never really understood the difference (or it doesn’t stick): panpsychism, pantheism and panentheism. Fortuitously, Christian de Quincey explains in his book Blind Spots. I’ve added links to Wikipedia, which has good definitions and background.
Pan is an ancient Greek word meaning ‘whole’ or ‘all of’.
Panpsychism is a philosophical belief about mind, meaning that all of nature possesses mind. Consciousness is in every thing.
Pantheism is a theological belief about the nature of God or gods. It argues that God and nature are essentially the same. God is immanent in nature.
Panentheism takes pantheism a step further – God is in all of nature, but also beyond nature. God is both transcendent and imminent in nature.
Panpsychism is consistent with pantheism, but less so with panentheism because that transcendent God lies beyond its concept.
As de Quincey points out, the important thing to take away is that God/nature is an ongoing, evolving, neverending creative process, and we are each a co-creative part thereof. Materialism is a dead duck, and atheism seems somehow irrelevant.