who is the first muslim emperor who converted his religion ?

In the history of india every body knows that the Indians r fighted with many foreigners. and when the foreigners won they raped the hindus....in every kind like social rape, women raped, villages raped, temple raped..... but when the indians won the don't do like this becaz of his manners. the foriegners converted hindus with his religions,... so i want to know the person who is a muslim emperor of india and converted his reliogion to hindu....