This is a clear cut and good information to know about Bahai; and, all the things Bahai disagree with are the cornerstones of the christian faith.
1. Christian's view of god is dependent on the divinity of christ not the other way around. If both of you believed in the same god, the same gospels, and the same message from the apostles whether they wrote it or not, I'd hope you'd take it as written from the bible not an interpretation of it. (Two messages from the same god doesn't make sense.)
2. Without Christ's atonement, there is no christian faith. Whether sins are inherited or the temptation is inherited, like in the OT, there needs to be some blood atonement for the forgiveness of sins. That's why you have wine as blood and bread as body. It's the sacrifice (blood) and life (mana/bread) of christ. Once you deviate from the atonement belief, it is no longer christian.
3. Forgiveness of sins through jesus is a must. If OT says animals can cover sins of god's chosen people with the jews, why say the blood of a human cannot be the final atonement thus forgiveness of sins in the NT. Forgiveness of sins is one of the central themes of the bible. That, and in christian view, why forgive others if you don't believe christ forgave you-if you are saying you believe in christian beliefs.
4. The sinful nature of mankind whether it's temptation to sin or inherited sin, this is a central theme in the bible too. Without sin or inherited temptation from sin, there'd be no need to believe in christ nor say one is saved. What christians do for others is a reflection of what christ did for them not separate from it.
5. The resurrection is a huge part of all denominations of the christian faith. Given you don't believe in atonement and nature of sin, I can see why you don't believe in the resurrection. However, it is not just spiritual but spiritual and literal go together in the christian faith. Once you depart the literal from the spiritual, you can believe in anything and call yourself spiritual but not religious. No one would need to be christian, or bahai for that matter, if some christians and bahai believe that god/creator cannot raise the dead. Somewhat like putting in god's mouth what he can and cannot do-from a christian point of view.
6. The triune nature of the godhead is also a cornerstone of the christian faith. Maybe it's you disagree with The Church's interpretation of it? Regardless the interpretation, you need to believe in the divinity of jesus and his literal role in salvation in order to see how the father/creator, son, and holy spirit are one with differing roles. People fuss over the definitions. I disagree with the trinity but the relationship with all three are in scripture no matter how we both interpret it.
7. This is all of christianity in a nutshell. But you need to know about forgiveness of sins and the divinity of christ to understand reconciliation from god and redemption/resurrection.
8. One Catholic on here told me that lucifer is a personification of evil. Maybe Bahai disagrees with denominational interpretations of these things but they are still extremely and literally important despite that. If you don't believe in evil, of course you wouldn't find a reason to be redeemed and saved. Yet, the "right/wrong" is a part of the christian faith. If Bahai believed in Lucifer/personified evil then they may find the need to be saved. It's a huge part of the christian faith. Without lucifer, no salvation.
9. Oh my gosh. The miracles of jesus is totally needed in the christian faith in order to believe in christ and the gospels. You no longer believe in the gospels as written when you take away christ's miracles. For example, if jesus did not raise the dead (his father rose the dead through jesus' faith in him), no one would have faith that there is a resurrection. So, giving the dead life is not only symbolic but the literal story needed in order for the disciples to "see" the works of christ not just hear him say it's all symbolism. Also, on that note, christ would not need to come if we stripped him of his divinity, role, miracles, and symbolized his teachings and kept general nature of his teachings that many religions share but are not the core of that faith.
10. If jesus doesn't return, then christian's faith in salvation would be moot.
11. I think Shoel is a Catholic teaching. Not many people like Catholics though they put the bible together. I'd assume they'd have more knowledge of the originals than those who broke off from them. (Telephone game)
12. What does Bahai believe differently about the OT prophets?
Instead of saying you believe in the bible, maybe say you believe in Bahaullah's interpretation of it. Differentiate yourself from saying you're a bahai christian to a Bahai who has some adopted christian beliefs.