Mt 6:9 Father in heaven....
In heaven, there is God the Father, of course.
Gal 4:26 Jerusalem that is above (heaven) is free and she is our Mother.
there lives God the Mother as well.
So If you want to go to heaven, just knowing and believing Father only is not enough. Do you want to be a member of Heaven? You should be a son or a daughter of God the Father and God the Mother.
Look at your physical family on this earth. Not a single person was born through their father only. What does it mean? This is very easy and natural thing that we have God the Mother as well as God the Father. Unless you throw away the fixed idea that we have Father God, we will never be a heavenly family member nor enter the kingdom of heaven.
World Mission Society Church of God does believe in God the Father and God the Mother. Our heaven is a happy place where our Father and Mother live with us forever.