The Bible testifies about the existence of God the Mother as well as God the Father. The Bible also calls children of God the Mother children of promise.

Gal 4:26-28
But the Jerusalem that is above is free, and she is our mother.
For it is written: "Be glad, O barren woman, who bears no children; break forth and cry aloud, you who have no labor pains; because more are the children of the desolate woman than of her who has a husband."
Now you, brothers, like Isaac, are children of promise.

What promise did God make with the children of God the Mother?

1 Jn 2:25
And this is what he promised us--even eternal life.

The people who received the promise of eternal life have God the Mother. They call Her "our Mother".

Gal 4:26-28
But the Jerusalem that is above is free, and she is our mother.

Among numerous churches in the world, this word of the Bible is being fulfilled in the Church of God.
When you believe in God the Mother whom the Bible testifies about, you can be the child of the promise of eternal life.