"Among the believers" stands in same league with Naipaul's famed trilogy on India, replete with glimpses of history, critical perspectives and thought-stirring (unanswered) questions.
As Paul Theroux pointed once, Naipaul never uses any word without exercising forethought, and his usual diligence in presenting sensitive subjects without even trace amounts of exaggeration applies to this book too. It will be a travesty of truth if people liken his writings to anti-Islamic bigotry or stance. I think such allegations are nefarious and conspiratory to discredit the momentous work he has done. He has been equally critical/questioning of the (Hindu) civilizational millstones that beseige India.
If at all one could ascribe any pre-determined judgement that Naipaul makes in this book, it is his unequivocal committment to the superiority of (current) Western traditions like Democracy, Individualism, Freewill, Science, Market Economics etc. He does not exhibit any particular preference among the Eastern civilizations. His predeliction toward Hindu-Buddhist civilization, if at all, is due to the apparent space these cultures provide to accommodate western values and certainly not because Naipaul derives solace from the theism/morality of these religions.
In sum, "Among the believers" is as honest an inquiry into the predicaments of tumultuous Islamic revival as much as his other travelogues are about other geographies. A must read for all (Muslims and Non-Muslims) those who want to enter into a transparent and protracted dialogue to contain Muslim disgruntlement in different quarters.