What god did people believe in before your god was invented?

Humans personified nature as deities: the sun, death, hurricanes, winter.

They believed in any number of false gods and idols.

False "gods", before the one true God revealed Himself to humanity.

Mainly, they believed in deities that controlled the elements of nature, such as wind, water, rain, crop growth, etc. Those deities later got upgraded to gods, who did the same jobs as the deities before. Later, the gods got reduced due to layoffs, and it was all put onto single overworked god, who had to rely on assistants like angels and devils to carry out all of his tasks. The end.

My ancestors worshiped the Norse gods before Christianity replaced them by decree of the King.

Our God wasn't invented but rather he is the creator. If he was invented, I'n pretty sure you would not be here.

After that God saw everything he had made, and look! it was very good... Genesis 1:31

For every creation of God is fine, and nothing is to be rejected if it is received with thanksgiving.  1 Timothy 4:4O Jehovah, you have been our dwelling place throughout all generations.2 Before the mountains were born Or you brought forth the earth and the productive land, From everlasting to everlasting, you are God.  Psalm 90:1, 2“You are worthy, Jehovah our God, to receive the glory and the honor and the power, because you created all things, and because of your will they came into existence and were created.”  Revelation 4:11

My God wasn’t invented.

Before God started talking to me! I thought he was a God that you can only read about in a Bible

They didn't. Archaeologists have already determined that the Great Mother is the oldest being anyone has ever worshipped.

Hold still. I’m trying to imagine you with a brain.