For anyone to deny that there are 4 distinct narrative voices indicates that that individual never studied religion from a critical or academic perspective. I long believed that Modern Orthodoxy must not ignore the evidence and claims made by the Academy.
A yiras shamayim does NOT study Torah from a critical or academic perspative. We study to learn to fulfill the mitzva of TT and instruction of how to do mitzvos.. This bible critique is a product of the haskala. RD im afraid you have gotten a hold of some rotten ideas of what Torah is.