I doubt that even one of those denominations, no matter how liberal, officially teaches that the physical Resurrection of Christ is an open question.
A denomination which teaches such a doctrine, like the Unitarians for example, is a non-Christian religion.
See what I mean? You simply declare that people who disagree with you aren't Christians and shazaam, problem solved.
why?
when it comes to the Bible, ultimately you are taking man's word for it, even all the stories about Jesus are as observed and recorded by others,
so surely there is room for discussion on some points
Jewish scholars have argued over the finer points of the Torah for centuries, that's a good thing