I think very few knew about the ISLAMIC truth is Mohammed was born as a Hindu and later himself converted to MUSLIM. That's why in Islam everything is oppisite to Hindu culture. Like. Our workship start with seeing sun they will start with moon and many more .... Before dying, Mohammad realise that creating ISLAM he has done mistake so he made a rule whoever will go to MAKKA (for HUZZ) they have to follow rules like. person should only wear dhoti person should do the parikarma (same we do when we visit temple) person should put jenau (which is symbole of hindusm)
As the truth is where people do the Parikarma there is a SHIVLING kept.
