High Quality Content by WIKIPEDIA articles! The concept of God in Sikhism is uncompromisingly monotheistic, as symbolized by "Ik Onkar"(one God), a central tenet of Sikh philosophy. However Sikhs believe that God also prevails in everything. The fundamental belief of Sikhism is that God exists, indescribable yet knowable and perceivable to anyone who is prepared to dedicate the time and energy to become perceptive to their persona.