That's fine, except it's 2000 years later. And things like creation, the flood, and Adam's fall are supported as literal by the NT. Then does the Quran support them as being literal or symbolic?
I think that a literal belief in Jesus as taught in the NT is justified. I don't see any reason why they would have or should have been taken symbolically. That is... if they are going to be believed at all. Because they are so "mythical" sounding I don't blame anyone for rejecting the Bible or the NT. Why believe Jesus was literally born of a virgin? Or walked on water? Or raised people from the dead? And he, himself, rising from the dead? The only reason is because that is what the gospel writers said happened. And I see no reason to believe that they were writing a fictional story that was meant to be taken symbolically.
That is the problem I have with the Baha'i interpretation. It is too easy to say, "Oh, well he didn't literally rise from the dead. He spiritually, or symbolically, rose from the dead." I think the easiest explanation, if it didn't literally happen, is still, that the followers made up and embellished the Jesus story, and at some point, those traditions got written down. People were taught them and believed those stories to be literal, actual events. And many Christians still do. That's the power of Christianity... That Jesus conquered sin and death. And then add in that the Christians are saved from Satan and hell also.
And I might as well add that I think it is strange that Baha'is accept the virgin birth story. Something that could easily be made to be symbolic, yet they reject the literal and physical resurrection. The resurrection is much more significant, I think, than the virgin birth. Why the need to reject that and make it only a symbolic resurrection? If things are going to be rejected about Christianity, then why not reject all of it? No virgin birth, no walking on water, no casting out demons, no resurrection... and make it all nothing but myths and legends made up by the followers of Jesus.