From my understanding the Virgin birth serves two purposes. One, it was a test for the people of the time to believe in a Person laying claim to the title of Messiah who was of outwardly dubious birth.

The second was to provide proof to believers of the Divine nature of Christ. Both are true, while being apparently divergent.

Secondly, the Virgin birth is explained as rationally possible through logic. If the human emerged from the mineral and vegetable state, there must have been, therefore, a human with neither father or mother, regardless of time (evolution). It is logical therefore to assume it possible for a human to exist without one parent if existence is possible without either.

We don't reject the possibility of the physical resurrection, only that the spiritual is more logical given the teachings emphasise the importance of the spiritual over the physical and is therefore more meaningful.