I am curious why that would be considered unBiblical
per se:
For he saith to Moses, I will have mercy on whom I will have mercy, and I will have compassion on whom I will have compassion. – Romans 9:15
IOW, seems to me that the deciding condemnation is rejecting the Holy Spirit's call to Christ (He is the Way the Truth and the Life). Those who have never rejected Him - perhaps never heard the Gospel while in the flesh (Abraham, Isaac, unborn children, handicapped, primitives) are at His mercy according to the above.
Anyway, that is the Spiritual discernment I have on the subject.