Ellie you are,of course, welcome to have any views or thoughts of God. 
I do personally believe I have some insight into God since I believe I have a relationship with him. I talk to him and I think he talks to me, although I don't hear voices.
I do totally understand your logic. I also feel life is not always completely logical, as we humans would understand. Many things are true that are not strictly logical. Love is one of those things (for me).
You are correct that Jesus is no longer mortal, but he was (I believe) fully mortal when on earth and that did mean, I believe, that he did not know what exactly would happen. He did not know everything. So when he made that sacrifice I believe maybe he did not know exactly how it would all go. These are just my thoughts. He knew that he would be raised but I still think it was a sacrifice.
Why exactly did God need to allow Jesus to die, it is tough and I maybe will never fully understand it. God said that sin needed to be punished and I think we all make mistakes, so none of us are perfect, but the Christian teaching is that Christ himself paid that price (he was perfect and so he could pay that price). The old illustration is of a judge who must impose a fine and yet knowing the person in the dock cannot pay, pays the fine himself.
For most religions in the world it seems to be about working your way into a relationship with God on earth and in heaven by good deeds. Christianity is the one that says, God has done it all. I do sometimes wonder with regard to forgiveness if people needed it to be that clear. As clear as a death, a sacrifice, and that a simple 'I forgive you' would not have been enough to convince humankind that they were acceptable to God. But that is just my late night museings, not theology. Certainly, I have just heard that it had to be that way.
At times it seems very hard to understand. I guess I like to think of it as Jesus running into a burning building to save a person, he is doing it out of love. When I pray now I tend to pray to Jesus, because I think he did that for me.
piprabbit what an interesting thought about the negative of the photo. I feel very sad when I see how badly the church has behaved and still does behave. I also feel very sad when I hear of persecution of Christians, and of those of any faith. There are lots of bad things in the world. But I believe love really is at the centre of the Christian faith.
I do not think for many Christian faith is about fear or anything negative. I guess I can't speak for many, so I will just say for me, for me it is love.
It is the fact that in all this world, in all the fun and joy and in all the sorrow, absolutely nothing makes me feel like God does. It is not even that often mentioned 'peace', because I am sometimes so troubled by the troubles of the world. I think it is that I am not alone.
In proverbs it says there is a friend who sticks closer than a brother. I think that is what that means to me, Jesus sticks close to me.
I must go to bed now, the ironing is all done and I have finished watching Obsessive Compulsive Hoarders! Good night 