Shamsher / Bahadur, Naipaul is as much a valid voice on Islam as yours on Sikhi. If you are allergic to his writings delve deeper. There is plenty about Muhammad and Shiasm away from the hagiography that Muslims peddle. Be a free thinker, be honest, investigate, apply the same theological rigour and interrogation as you do in other areas of your life and spirituality. You can start with Ibn Warraq, a former Muslim. The book by Kersh will give you the context for many things about Islam and Shiaism that are perplexing to outsiders; the truth of Islam being a vehicle for Arab supremacism and bigotry, the imperialistic nature of Islam, the sectarian violence at the root of shiasm, the Jewish-Pagan-Zoroastrian-Christian plaigarism at the heart of the religion, and most especially the cult like dogma of prescribing death to those who leave Islam, a distinguishing feature of the religion, which individuates it from all other faiths in the world.