Pandeism is a philosophical belief that combines the ideas of pantheism (the belief that God is synonymous with the universe) and deism (the belief that a higher power created the universe but does not actively intervene in its operation). Pandeists see the universe as a dynamic and self-sustaining entity that encompasses both God and the physical world.

Pantheology is a system of theology. Pantheology embraces all religions such as omnitheism, pandeism, pantheism and is studied by a pantheologist.

About 150 years. Please exercise care when you read works by authors who carelessly or indifferently mix Greek (pan) and Latin (deo) root words indiscriminately.

The way I understand this idea is that pantheism says that God is in everything. Hence, pan meaning a wide range of area, and theism which relates to God. God is much bigger than pantheism because the Bible says he has to humble himself to be able to fit in the universe he has created. We cannot comprehend the bigness of God with our finite minds. Colossians 1:17-18 tells us that God holds his creation together. Imagine what would happen if God stepped back and abandoned his creation for any amount of time. By believing in pantheism, you are limiting God's bigness even though you probably won't agree.

The term for belief in God without organized religion is often referred to as spiritual but not religious (SBNR) or spiritual but not affiliated (SBNA). This viewpoint acknowledges a personal connection to a higher power or spiritual realm without subscribing to the doctrines and practices of formal religious institutions.