It’s not matter of believing in spirit world. You are a spirit with a physical body either you believe it or not. You came to Earth at this age, to learn something for your soul. God allowed us to create anything we want, under his unconditional love, you can even create a reality that you can believe you aren’t unconditionally loved by God. We chose to live in a lower vibration to learn how to stay positive even in such a negative world. This is not something mysterious. Higher science that most people on Earth don’t know. We are in like kindergarden compared to other civilizations in the Universe.