India will remain secular as long as Hindus are in majority because Hindus are fundamentally open minded with belief in "Sarva Dharma Samanvaya". Once the balance tilts the other way, our brothers and sisters in Pakistan and Bangladesh have shown what would follow. After all they were us few decades ago.
Look at Kerala, even in most educated state, Muslim league and Church is so strong when it comes to ballot. When was the last time anybody looked upto Hindu Swami to ask who to Vote for?