Any GS member who changed his inherited Belief System ?

That's so true brother, same story here.. "we" when we reverted initially we used to call ourselves "Muslims" but then we "my father, mother, brothers, sister and I read a lot of books and researched about every sect. and finally we came to the conclusion that we're "Sunni - Deobandis" proudly. we found other sects doing shirk and biddah [for eg; barelvis kiss their thumbs when we say Huzoor SAW, and do "koondas" (Hazrat Iman Jaffar Sadiq's niyaaz) and "khatam-e-qadariya" and go to mazaars for mannats and etc etc etc...] and our hearts weren't satisfied to follow these things.. my whole naniyaal is a born muslim family but they're not too religious, otherwise we might not have researched and only followed the sect they were following. We're all really really very happy to be reverted to Islam and Islam is the best religion and the only righteous path [IMHO - no offense to anybody here]
and brother - JazakAllah khair for congratulating both of us.