A person who conducts mass murder on the pretext of extremist religious ideas he is holding and enforces minorities to convert to his ideas or leave/die is by any means a fundamentalist of highest order.
He might be hero of fundamentalist Hindus, but sugarcoating and twisting words to make him look like one, wouldn't fool any sensible person.
If you are indeed attempting to discuss this seriously and not just troll, here's why you're wrong.
1. Modi did not murder any one. He was accused by some of complicity and by others of inaction during the Gujarat riots. Cases that lasted a decade, pursued, first, by a government that was bent on destroying Modi and, second, by a Supreme Court that even the most disenchanted Muslim respects, found no evidence against him. He asked for police reinforcements from the neighbouring Congress ruled states the day after the riots began. These forces would, presumably, not be amenable to Modi's control. Unfortunately they refused to help. From an unbiased perspective you can either say that Modi was incompetent or you can say he did a damn good job given the enormity of the problem in 2002. Neither makes him an extremist mass murderer.
2. Even Modi's most vicious critics haven't accused him of forcing minorities to convert. The people behind the conversion campaigns 'reconverting' Muslims and Christians to Hinduism are India's equivalent of the evangelical tea party types in the US. I wish they didn't exist, and I would agree with you if you classified them as fundamentalists, but Modi has nothing to do with them other than the fact that some of his party men (and MPs and ministers) have links to these groups. These links are unfortunate and something Modi needs to stop, but by no means different from a Republican in the US coopting an evangelical pastor for an election campaign.
These conversion campaigns come on the back of a lot of conversion activity by Muslims and Christians that some Hindu groups have used to spread the fear that minorities are trying to overrun Hindus.
3. What you describe as Hindu extremism so far is at a very nascent stage. It, so far, isn't as organised, militarised or pernicious as Islamic extremism is many parts of the World. We do need to be vigilant, however, because there is nothing in the intrinsic character of any religion, Hinduism and its offshoots included, that prevents radicalisation.