Sorry, i don't believe that Jonah was allegorical, I just used it as an example as to how one may keep their faith in such circumstances, point was, we are in an interpretive or exegetical process.
Both Jesus and Jonah I consider to be literal and historical accounts. On the other hand, I consider the parable of Lazarus and the rich man to be allegorical - the setting is fabricated and implausible.
How does one determine when to interpret a pericope as literal, parabolic, metaphorical, figurative, hyperbole, etc... First, one's hermeneutics: I consider the Bible to be meant as a literal and historical account 95% of the time, with the allowance of cultural idioms, and various literary conventions that are used in every day speech. The majority of the time when a non-literal account is meant to be employed, it is typically indicated by the narrator, or the character offering the account to his audience.. And second, that is the art of exegesis - when to know what is the authorial intent of the passage, and how is it to be read. This is the entirely subjective aspect about Biblical interpretation, and as to the reason why there are so many conflicting doctrines and denominations. As far as I can tell, nothing can be done about this in order to unify the consensus, but merely, it is the wisest person in the room who will discover the truth.
No, if the Gospels of Christ were allegorical, they would be absolutely meaningless to me, because, one, of the subjectivity required in such a type of interpretation, and two, because they are the most prevalent and incumbent part of the NT - to have that much predominance of Scripture be allegorical, would be impossible to be certain or dogmatic on anything.
Thanks!