How can YOU separate the allegorical from the literal? There are so-called preachers who claim Christ did not actually come back to life but only in an allegorical sense. Same for the miracles.
And how would YOU separate the Sadducee beliefs from the Pharisee beliefs on resurrection of the dead and angels?
Most allegories are ludicrous like Jonah living in the fish at the bottom of the Mediterranean for 3 days . Adam and eve in the “garden of eden”, Joshua stopping the orbit of the Sun, the flood and the ark. There are so many. They are man’s primitive attempts to deal with creation and the complexity of God . But Jesus had actual and repeated eye witnesses to his Resurrection . In short it boils down to evidence vs rank conjecture and contrivance. That is just my view. But it is how I tell the difference in answer to your fair question.