"ye have the testimony of all these thy brethren, and also all the holy prophets? The scriptures are laid before thee, yea, and all things denote there is a God; yea, even the earth, and all things that are upon the face of it, yea, and its motion, yea, and also all the planets which move in their regular form do witness that there is a Supreme Creator (Alma 30:44)."
Alma lists eight things proving the existence of God. Doctrine and Covenants 88:45-47 states,
"The earth rolls upon her wings, and the sun giveth his light by day, and the moon giveth her light by night, and the stars also give their light, as they roll upon their wings in their glory, in the midst of the power of God. Unto what shall I liken these kingdoms, that ye may understand? Behold, all these are kingdoms, and any man who hath seen any or the least of these hath seen God moving in his majesty and power."
The order of planet Earth, the tides moving with the phases of the moon, the artistic beauty of a sunrise and sunset, and the soothing sound of waves upon the seashore give proof of God, because all things are in order. Chaos cannot create chaos. But God, who is a God of order, can turn chaotic matter into order, as in the creation of the earth. It is explained by the Prophet Joseph Smith in these words:
"The word create . . . does not mean to create out of nothing; it means to organize; the same as a man would organize materials and build a ship. Hence we infer that God had materials to organize the world out of chaos –chaotic matter (HC 6:308-311)."
Only God can turn chaos into order and be as beautiful as this earth.
I myself know God exists. I use the term "know" the same way one "knows" the Sun shines because I have experienced God. The Sun still shines regardless if people say it does not; that fact is a reality. God still exists regardless if people say He does not; that fact is a reality. In the Name of Jesus Christ His Son, Amen!