Wonderful, excellent critique about God and how others see Him ... or do they? and those who do not see Christ as the Son of God, as well as the other things that you brought up!
I think that everything that you wrote is extremely valid, especially when you can see how the Koran actually denies that "Allah" is our Father, or the Father of us all. It says that He is just the Supreme Being, but not our Father, in that sense. But I think that they do think that He created us ... a strange disconnection of sorts, it seems to me. They also recognize Jesus as one of the messengers sent by God - and a very good one, at that - but NOT the Son of God (since Allah doesn't have "sons" since to them He - God, or Allah - is not our Father), and they also say that Jesus did not die on the cross, but was taken down in secret while still alive and lived his life elsewhere ... and so, he did not rise again, since he didn't die on the cross. That is what the Koran says.
That said, here is how I see the whole picture which you so aptly put into words in your questioning. We can actually look at this picture from two different perspectives ... The One True God, who is the loving, caring Father that gave birth to us all, and that other opposing force that we may know as Satan or, more aptly, Lucifer, who is the polar opposite to who our God is. And Lucifer, is real, by the way (this is a whole 'nother story). These are really the two "Gods" out there that people worship, mostly not knowing what in the world they are doing. Most people contain a combination of both aspects, since they live their life in an unconscious state and thoughts, and are simply acting out "instinctively" whenever they encounter a problem or something that they have to work out. The key here is to understand that we draw to us whatever it is that we hold in our judgments and beliefs, depending on how deeply they are embedded in our emotions, since emotions are magnetic and these emotions are what pull these parts to us in life. So, if we are holding things which say that it is all right to hurt people and/or cause pain to others without caring or heart space involved, then this will draw to us the Luciferian energy, and we are in effect worshiping this "god" in this area. If we are in touch with our feelings and hold to the idea and Ideal that life is sacred and that we want to grow and live in love, especially with helping others in all of our thoughts and actions, then we draw to us the Loving God who is our Father, and we are worshiping Him then. This is why it is so very important to become aware of our Ideals and start to live them, while nurturing our feelings so that we can be helped and guided by the truth that they have to tell us, and also to begin to learn to start observing life until we can come to understand instead of judging, and lastly, we need to grow in our awareness and greater understanding of life ... in other words, to become a conscious spiritual being instead of an unconscious one that lives only in instinct. God, our Father, comes to us when we resonate with His loving energy and ask for His help in this same spirit of love. Lucifer does the same, with the opposite non-loving energy.
So, in other words, it doesn't really matter, I think, what religion that we are connected with, but what does make the big difference is the kind of real love that we have in our heart and how we express that love in our every day life. The problem here is that the judgments and beliefs which carry over from how we relate with our religion - and this applies to every religion - CAN and does make a difference, that may sabotage the potential connection that we could have with our Father God. Somehow we need to be able to get free of those "religious dogmas", that are in every religion ... some more than others, and come from our own heart and feelings in order to be able to be true to ourself and be in harmony with God's Love.
As far as believing in Christ is concerned ... Christ is that sacred part of God's love that is embedded within our heart, and everyone has this ... but here they must connect with their inner being with their Ideals and willingness to live them in order to know that Christ within. Jesus was the man ... the Christ is that oneness within which Jesus become one with during his life ... and so may we all, regardless of our religion. Believing in Jesus is not so important is it is to understand and live those lessons which he gave to us, and then connect to the Father, who is our God. All will, in time, understand Jesus for who he is and what he accomplished, especially once they have reached that state of love in their hearts.
I hope that I haven't been too rambling here, but this is how I see it. I also hope what I said was helpful in addressing what you asked. One thing to remember, though ... don't ever condemn yourself for any of your past actions or lack of awareness ... be kind to yourself and come to understand what was happening in those early days when you may not have had a choice or did not know any other way. Remember, Our Loving God does know your heart and desires now, and this is what counts ... you can heal the past and bring your being into a very high loving spiritual place regardless of what has happened in the past. I had to do that ... many people do. Remember Paul in the Bible ... he wasn't such a saint in his earlier life, either ...