M*W: You're only partially right, Yorda. All the Abrahamic religons do come from the same 'god,' Amen Ra, as in Ab-RA-ham, Is-RA-el, etc. All religions known to humankind have come from early humans fearing and awing the sun, solar system, the elements, and women.
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Yorda: You know the 4 elements. They are also called the 4 faces of God (the Zodiak) You can see them, if you divide light into a spectrum of colours. Red would be fire, green would be air, blue would be water and black would be earth.
"Fire" is the first one of "God's faces", therefore it is also the most important one. The sun is a manifestation "fire" on a material state. Lion is a manifestation of fire on animal state and a human like Jesus is a manifestation of fire on human level, which is the last level. Humans are the only creatures able to express God (themselves) fully.
Anyway... religions talk about a thing which they call "God". Many people have misunderstood what God really is. If you have read Eastern religions, they often refer to the SELF when they talk about God. They say that God is the same as our SELF. This is not so easily detectable in Western religions. People are different in the West, so the Sons of God had to teach differently.
God can be likened to light (the Sun). You know that if you divide the light, you find infinite colors. In Hinduism, they talk about infinite "gods", which are a part of one supreme God (light). These infinite gods represent natural elements, human psyche and so on. Of course, there is also a God which represents the sun. This is the way the sons of God teached us, with colorful things rich in fantasy... and still, the truth is in them!
God is not the sun, although it is easily misunderstood. And since God is everything, it ALSO represents the sun. God is like light, like the sun, but it IS not the sun. The sun shines so that we wouldn't walk in darkness here on earth. God, the Christ, shines in our hearts so that we wouldn't walk in darkness, inside ourselves! God (our true self) is like the sun, it isn't partial. It shines with his love (fire) to all people, just like the sun shines upon all humans, whether they are good or bad. In the sun (and God), the good and the bad are the same thing, they don't exist! The sun is a good representation of God.
People misunderstood the teachings of the sons of God, that's why they started to worship the physical sun. It may also be that they purposely told that the sun is God (because light is like God) so that the very early humans could get an idea of what God is.