FIRST OF ALL INDUS VALLEY CIVILIZATION IS NOT A HINDU CIVILIZATION...
HINDUISM GAINED ITS FORM AND TEXTURE AFTER INDUS VALLEY CIVILIZATION WHICH IS AROUND 3000 BC, RIGVEDA AND OTHER LATER VEDAS WERE WRITTEN AFTER 2000- 1500 BC. RAM AND MAHABHARATHA HAPPENED AFTER THE VEDIC PERIOD.
HINDU WORD IS BORROWED FROM PERSIAN AND ARABIC VOCABULARY... IT SIMPLY MEANS PEOPLE LIVING BEYOND RIVER INDUS, IT DOESNT CATEGORIZE ANY RELIGION.
MUSLIMS CAME TO INDIA IN 622 A.D. THE WORLDS FOURTH MOSQUE IS SITUATED AT KONDAGALLUR KERALA, WHICH WAS BUILT DURING LIFETIME OF MOHAMMED SAW BY MUSLIM TRADERS.
THE SO CALLED RELIGIOUS GROUP OF HINDUS HARDLY RULED INDIA FOR 600 YEARS OF 3000 YEARS OF HISTORY 1000 YEARS THE BUDHISTS RULED INDIA 1200 YEARS THE MUSLIMS THE BRITISHERS 200 YEARS.
MUSLIMS ALSO INVADED INDIA APART FROM TRADING ROUTES OF KERALA, THE SAME WAY THE ARYANS ALSO INVADED INDUS VALLEY CIVILIZATION AND DROVE THE DRAVIDIANS TO THE PRESENT SOUTH INDIA.