Why are you specifically focusing on the word and trying to prove some bizarre point. why not talk about raheem and Quran? All if this makes me think you want to glorify Hinduism. The words ram and raheem were used to address the masses as those were two dominant terms for "almighty" in the region. There is a reason gurusahib gave us the beautiful gurbani. Yes, read, rationalise and conceptualise other scriptures and holy books, for it helps us connecting with gurbani with new found faith and belief. Religion has it's hierarchy. Even if you believe that Sikhism is an offshoot of Hinduism, that simply means that you accept that Sikhism is a new and better edition of Hinduism. No hatred against any religion for all lead to one,some take the direct path while others the bypassed path.