Brother, All followers of any religion before Muhammad (PBUH) will definietly had gone to Heaven if they have worshipped the true god (Monotheism). If they worship one god which can not have any shape, size or any feature, then they will be in Heaven. Try to read Vedas, Teachings of Buddha, teachings of Moses (PBUH), Christ (PBUH). They all taugght us to worship one god and did never ask their people to worship them,,,,, make images of themselves and worship.... No No No. We people have transgressed from the right path that is why Muhammad (PBUH) came to teach us the complete lesson of monotheism and guide mankind to heaven by worship only one god.