how did "GOD" come into existence?

Answer 1

Revelation 1:8 states:

"I am the Alpha and the Omega," says the Lord God, "the one who is and who was and who is to come, the almighty."

Alpha is the fist letter of the Greek alphabet. Omega is the last letter.

God is revealing the truth that He (or She) is eternal. He has been here from before the beginning (the alpha) and will be here after the end (the omega).

God is also with us for every step along the way.

With love in Christ.

Answer 2

In the mind of fearful men.