The Bible was originally written in Hebrew, Aramaic (the Old Testament), and Greek (the New Testament). In the Hebrew version of the Bible, Genesis 1:1~2 is written as follows:

Genesis 1:1 בְּרֵאשִׁית, בָּרָא אֱלֹהִים, אֵת הַשָּׁמַיִם, וְאֵת הָאָרֶץ.
Gensis 1:2 וְהָאָרֶץ, הָיְתָה תֹהוּ וָבֹהוּ, וְחֹשֶׁךְ, עַל-פְּנֵי תְהוֹם; וְרוּחַ אֱלֹהִים,
מְרַחֶפֶת עַל-פְּנֵי הַמָּיִם.

Dictionary:
elohim – Hebrew: אֱלֹהִים
A name for God used frequently in the Hebrew Bible.
Origin From Hebrew ‘ĕlōhīm (plural).
(English Oxford Living Dictionaries)

The word of Elohim is "plural" not singular.
The word “God” in the English Bible is the translation of “elohim” meaning “Gods”.
What does it mean? This means there are more than one God.
Then how many Gods are there? Let's find it out through the bible.

Gen. 1:26 『Then God said, “Let us make mankind in our image, in our likeness, so that they may rule over the fish in the sea and the birds in the sky, over the livestock and all the wild animals, and over all the creatures that move along the ground.”』

Gen. 1:27 『So God created mankind in his own image,
in the image of God he created them;
male and female he created them』

God created man in the image of God : male and female came out.
Which means that there are the male image of God and the female image of God.
For a long time, people have called the male image of God “God the Father.”
The bible, however, testifies not only the male image of God but also the female image of God. Then, what should we call the female image of God? We should call Her "Mother".

That's why the bible testifies that there exist God the Mother as well God the Father.
Mat. 6:9 『“This, then, is how you should pray:
“‘Our Father in heaven,.."』

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

All Christians read the same bible. Then if they truly believe in God and the words of the bible, then they must believe in God the Mother too!

Dear loving brothers and sisters in WMSCOG, let us have firm faith in both God the Father and God the Mother till the end and enter the kingdom of Heaven together! 😀