That was true in the OT. But as of the coming of Jesus, we were introduced to the fact that because the Father is Jesus' "father", and we can be adopted into God's family through Jesus, God can become our Father as well. This is not figurative, but is in actual fact what happens when we are adopted by Him.
Nope, you should say Father. He is not our mother.
		
		
	 
He is not our Father either, 
literally speaking.
That's what I am trying to say.
Of course it is 
a fact that God loves us with infinite love and care, 
as if He were the most loving Father. Of course He is our Creator, just as parents are the co-creators of our biological lives. So there are many ways in which God is our Father. But none of those ways is literal.
I was just making a reflection 
on the words used, Doug.  Not in the reality of things underneath those words.
Literally speaking God is not our Father because He didn't beget us biologically... you know, having relationships with our mother and passing his genes to us. God is our Father
 in a deep and symbolic sense. More literally, we should say He is our Creator and Sustainer.
Paul considered Onesimus his son, his child, who Paul had "begotten" while in prison. This has many beautiful meanings, but none of those meanings is that Onesimus was literally the son of Paul.
Same with adoption. We are not 
literally adopted. Are we?
We are reconciled with God, despite our indignity, and this is perceived symbolically as having been "adopted".
I could go on and on... we all use a lot of terms in our language that we take from the metaphors and analogies found in Scripture. 
This is good, it is wonderful... as long as we always keep in mind that those are
 language tools to bring deeper truths.
Keeping this in mind will help us to be more patient and prudent when we debate with other people.