nut, there is a typo. it wasn't christianity that evolved from islam and judaism. it was judaism(in the BCs) -> Christianity(1st Century AD) -> Islam (7th Century AD). The concept of advaita vedanata (non-dualism) came much later when indian subcontinent was attaked by the muslims and threatened the end of hindu rulers there aound the end of 1st millenium (9th century, i think). hindus just had too many gods, especially corrupted by the priests who emphasized pleasing gods of all kinds. Then Guru Sankaracharya, a vaishnava propounded advaita vedanta when he said, although there are atma(s) and so many forces of nature, they are infact the absolute himself functioning simulataneouly with eachother in many forms. The doctrine is based on three truths; 1. Supreme Brahman is the only reality - Transcendental level - Parmathika 2. Jiva (livings) and Iswar (gods) are all reaility - pragmatic livel - Vyabhaharika 3. Material world is also a reality - apparent level - pratibhasika However, the Supreme Brahman has completely control of all the truths with a special tool he posses - Maya or Illusion. He created Maya to hide from the real truth of understanding so, that human minds can only find the Supreme Brahman with spirituality, not materialistically which he called Moksha (Salvation). And there are four ways to achieve it - Bhakti, Karma, Gyana and Raja.