I don't expect you to buy my tree example... like all metaphors it is imperfect.
However the various subsets of Christianity have all been based on Jesus teachings, and they have been coloured by other writers, from the old and new testaments.
Every one who reads the Bible interprets and filters it with their own Personality, understanding and prior education. This is unavoidable.
What little of Jesus message that has come down to us is certainly not unchanged. Each writer in the Bible has recorded different parts of the stories and messages and put their own slant on it. Even today the Bible is being rewritten in the light of new discovery and new scholarship pertaining to the lives and times of the Authors.
Jesus never wrote a Gospel, as far as is known, he never wrote anything.
His church is based on the memories of those who knew him and those that came after. His disciples seem to have left us very little indeed to work with. Those who were the closest to him, Like Mary Magdalene, who was also the first he showed himself to, risen from the grave, Have had her Gospel destroyed (with only fragments remaining) because the Church did not like what she was saying.
The Branch of the Church you follow is no more "true" than any other. It is based on the same limited material as all other branches. And is no more favoured by God than any other.
There is every reason to believe that God loves all mankind equally.
I can agree with you on many things but we differ on one important thing. There are no "various subsets of Christianity". There is Christianity, the Gospel that Jesus taught, then there is everything else. We agree that people filter what they read and that is why we have so many different churches, but that doesn't make them Christian.
The churches started by Paul were branches of the same church not independent, Paul kept tabs on them by sending people to check on them and he sent them letters of correction. The writers of the Bible didn't slant the Gospel. They were dealing with baptized members who had heard the Gospel. They reminded them of the parts they had changed or modified to get them on track. Those who believe we are saved by faith alone and works are of no value have started a church based upon Paul's letters to the Corinthians and paid not attention to James or Matthew.
Your statement: "His church is based on the memories of those who knew him and those that came after" leaves out a very point. Those writers had the Holy Ghost (The Spirit of Truth) to refresh their memories. I would say God helped them out a little. Then you say "The Branch of the Church you follow is no more "true" than any other. It is based on the same limited material as all other branches. And is no more favoured by God than any other.", is amazing unless you are not a Christian. I haven't said if I believe the true church is even on the Earth, but I do. I can research the Bible and look for the true church based upon what is written. I can:
Matt 7:7
7 ¶ Ask, and it shall be given you; seek, and ye shall find; knock, and it shall be opened unto you:
God Knows His church even if you don't. And He does favor His church over all of the others, because all of the others belong to Satan.
Does God love everyone equally?
John 15:10
10 If ye keep my commandments, ye shall abide in my love; even as I have kept my Father's commandments, and abide in his love.
John 14:21,23
21 He that hath my commandments, and keepeth them, he it is that loveth me: and he that loveth me shall be loved of my Father, and I will love him, and will manifest myself to him.
23 Jesus answered and said unto him, If a man love me, he will
keep my words: and my Father will love him, and we will come unto him, and make our abode with him.