God is Spirit, though, Creating the Material Universe
It is said that God is spirit; accordingly we have to show our respect to God with our spirit.
No matter how much we study the world and the universe, we cannot find material God, or we cannot see God in the form we can understand. However, we can feel interference with the nature around human beings by God. As an example, the sun and the moon look in a similar size to each one from the earth. There is no scientific reason for this phenomenon, but due to this configuration in the sky with the similar sizes of the sun and the moon, human cultures and religions have been influenced.
The universe is based on a theory that the absolute magnitude of charge of an electron is equal to that of a proton, thus assuring formation of an electrically neutral atom. It is unknown why this theory is possible in the universe, whereas without it or with a different theory, no substances are possible in this universe. In other words, if another theory is true in this universe, no atoms, molecules, and matter can be possible.
What we have to think is only that God made this universe based on arbitrary physical theories to make the universe constituted in a way suitable for emergence and development of human beings. The more scientists learn, the more they should find traces of interference by or influence of God.
However, in most the periods in these 2000 years ago, people had no such knowledge of modern science, but many people came to believe God through religious traditions of Judaism, through Christ Jesus, or through Quran. It is because God is spirit, and men had spirits in any old time.
Our spirits and minds interact with matter and with natural, social, and human phenomena. However, we feel, think, and make decisions following work of our own spirits and minds. And, in freedom of our minds, we can accept or deny God. And, as the world and the universe are designed and built according to God's will, it seems natural that men living in this world and universe perceive, realize, find and accept God.
However, to accept God in our spirits, our minds should be cultivated suitably. As Judaism 2000 years ago lost effect of this cultivation of minds, God sent His Son Christ Jesus for right cultivation of spirits and minds of Jewish people and others. But as Christianity lost its power of right cultivation of minds of Arabs, God gave Quran to Arabs, etc.
This is one theory, although it is unknown why this theory is possible.
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Mar 1:10 And straightway coming up out of the water, he saw the heavens opened, and the Spirit like a dove descending upon him:
Mar 1:11 And there came a voice from heaven, saying, Thou art my beloved Son, in whom I am well pleased.