Well obviously Abba ARE God. That goes without saying .
But for the benefit of anyone who is still wondering what this is all about ...
Romans 8:15-17 "For you did not receive a spirit of slavery to fall back into fear, but you have received a spirit of adoption. When we cry, ?Abba! Father!? 16it is that very Spirit bearing witness* with our spirit that we are children of God, 17and if children, then heirs, heirs of God and joint heirs with Christ?if, in fact, we suffer with him so that we may also be glorified with him. "
"Abba" is an intimate word for father. We don't really have an equivalent word. Daddy comes close, but is too childish. I'm told that the french "papa" is closer. Loving, intimate, dependent, but also respectful and mature.
It is the word that we translate as "Our Father" in the Lord's prayer and pretty much sums up Christian teaching about our relationship with God in a single word
And my whole gut finds it incomprehensible that "Abba" would cause people to be rejected on the basis of something as innate as their sexuality, which in the context of a stable, committed relationship harms no-one. Which is why we're having this discussion.