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God exists. You may have felt it. So have millions and millions of believers. Some have felt God through the beautiful harmony of nature, some through religious scriptures. Others have had spiritual experiences. Millions have had near-death experiences.
In any case, God is not something you just believe exists. He is reality. He is as much a part of reality as you are, or as any physical object is. It is not only physical things that are real.
Some people believe that, in the same way that people used to think that the Earth was flat, and that the sky was an arc that stretched above the Earth.
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When asked on an Australian TV program, “Do you believe in God?” famous Canadian psychologist and author Jordan Peterson

“said he considered himself a deeply religious person and he acted as if God existed and he was terrified he actually might.”
(Quoted from “Why rock star psychologist Jordan Peterson struggles with this question”, an article by Stephanie Bedo on news.com.au 1st March 2019.)

Father Moon says,

“We have a mind. The mind is invis­ible and may not appear to exist; yet it exists. Does it exist in the head, or in the heart? Mind exists throughout your body. It is present in every cell of your body without exception. The same is true for God. Because this world is like His body, He is present everywhere in the world.”
– From a speech Sun Myung Moon gave 8th January, 1971, quoted from Cheon Seong Gyeong (2005 version), Book 1, Chapter 1.

“You cannot see God. Can you see energy? Since God is the original body of energy, you cannot see God even in the spirit world.”
– From a speech Sun Myung Moon gave 21st October, 1979, quoted from Cheon Seong Gyeong (2005 version), Book 1, Chapter 1.

And by all means: God is not unscientific. Natural science does not disprove the existence of God.