do Muslims really used force for conversion? to all you answer you have read this and search it by yourself.
1. how many year did Muslims rule on subcontinent almost 1000 years, still Hindus are in majority why?
Muslims did not rule India some looters, killers and dacoits did who had only three interests; wealth, power and sex. The cared less for anyone to worry about who is Muslims or Hindu expect where their political interests were served. Name a few things that they did for ordinary people Muslim or otherwise, only exception being perhaps Sher Sha Suri.
In general its bad politics to corner the majority, Auranzeb the religious fanatic tried that and Mughal empire went rapidly downhill from there.