@adrian009
A lot of things similar are things everyone can have regardless who they are and their worldview. It's not specific to a religion. For example, gratitude, love, and trust are among those traits not specific to religion. Sin. Rebirth. Is more specific to religion.
The main purpose of The Dharma from Siddhartha is ending rebirth.
The Round of Rebirth: samsara (it's best to read it in full since it has multiple citations)
Why is that? From an inconstruable beginning comes transmigration. A beginning point is not evident, though beings hindered by
ignorance and fettered by
craving are transmigrating & wandering on. Long have you thus experienced stress, experienced pain, experienced loss, swelling the cemeteries — enough to become disenchanted with all fabricated things, enough to become dispassionate, enough to be released."
—
SN 15.3
Siddhartha teaches that we are reborn or come back into this life because we are attached to suffering. Suffering not meaning specific to pain and pain of spirit as in spirituality, but pain of birth as well as death. In christianity, there is no pain of birth and death because death is not important in comparison to salvation and union with god thereafter:
Salvation vs illusion
John 5:24 scripture teaches that death is not important (context) because once one dies they have eternal life with god. Not so with The Dharma of Siddhartha. He says instead, (I'll find the sutta later) that once we are reborn the last time we actually die because there is nothing left to be attached to. No divinity nor blissfulness. No suffering doesn't mean our flesh would be perfect. We still born, suffer, age, and die. We aren't attached to it.
Here is another: The Arrow
As he discerns the origination, passing away, allure, drawback, and escape from that feeling, no ignorance-obsession with regard to that feeling of neither-pleasure-nor-pain obsesses him.
Sallatha Sutta: The Arrow
Christianity focuses on saving one from the results of suffering that seperates that person from god.
The Dharma focuses on ending suffering by changing ones mental state thereby, he still suffers (he isn't saved from it literally) but saved from the pain by his own effort not for anyone else. Another Romans 8:38-39. Siddhartha was never a Christian. If anything, he seperates himself from Brahma. So if you want to know the "god Siddhartha however existed" you need to know more about hinduism. But regardless, u like christianity, brahmas existences doesn't equal to his ability to relieve us from being reborn (Buddhist view)
The foundation of love etc from The Dharma is specific to our actions. Our actions not our faith is what changes our karma towards no rebirth. Scripture doesn't use works as a foundation for God connection but incorporates it with faith towards salvation (not understanding as in The Dharma) from death.
Also, metaphysically, christianity doesn't have many realms to which one is reborn as The Dharma.
These differences aren't bad they are just, well, different.
As for diverge, it depends on how you see it. I'd say they don't reflect each other. Though scripture sees itself as unique and makes divergence on its own. People die because of it on scripture and in real life. The Dharma isn't like that.
But anyone can compare the two religions and go by their positive attributes and still accept their detergent and different views at the same time.