R’ Dr. Farber recently came out with a manifesto:
I believe in Torah Min Ha-Shamayim, that the Torah is from heaven, and that the entirety of the book is nevua (prophecy) and represents the encounter between God and the people of Israel.
So where does this inquiry leave me? First, it appears that the Torah is a layered document. While I am not convinced of the documentary hypothesis (JEPD) per se, it seems that the Torah has evident signs of being an edited work which makes use of multiple sources and contains layers of redaction. The Torah contains inconsistencies both in its laws as well as its narratives and lists. At first I toyed with the possibility that these might be literary devices, but this only works for some of the examples (and not for many of them).
Second, religious practices as well as aspects of the Jewish belief system have changed and developed over the generations. The Oral Torah explanation proffered by the rabbis, i.e. that all of the practices not found in the Bible were either told to Moses directly at Sinai or are derived from midrashic reading of text, does not even begin to realistically address the religious changes Judaism has gone through in a believable way.”
I’d look at his own approach and manifesto in its entirety before deciding whether he’s an apikores. R’ Farber, R’ HaLivni, etc. are extremely learned men, and their ideas and accomplishments should be understood fully.