When the Borg began bad-mouthing other religions and produced the "Mankinds Search for God ", it was about that time when the Satanic Versus by Salmon Rushdie came out and he bad-mouthed the Muslim community. Probably the Borg got spooked by the fall-out as the Muslims had a price on his head.
I understand he still is in hiding to this day. The Borg likely got spooked by all of this and the book fell under the bus. I could just be speculating.