What Catholic Scripture Scholars tell us is equivalent to 'the Church' tells us.

If the Genesis stories were intended and inspired by God as a myth form of writing, we need to deal with that fact. Our theology needs to reflect our knowledge of Scripture.

All the constructs we have developed about a 'fallen' nature are actually our given 'human nature'. Even the myth picture seems to realize that! Humans were created with death as part of the prospect, like any life-form; and they seemed to 'sin' very easily. Not much difference from 'before' or 'after' the 'fall' being pictured.