The whole India knows that BJP is hindu extremist party, there is very few non muslims in that party. I know there was one muslim (Shahnawaz) in that party who gets criticised by all the muslims in India. BJP has very close links with hardcore extremist parties such as VHP, RSS, Bajrang Dal etc. Maybe you need to get YOUR information from a better source.
Economic growth had nothing to do with MODI just like governments can’t be blamed for current financial crisis. Modi has always been an extremist from his student days, Americans banned his entry to US because they knew he was a nutcase and so did whole India but his negative image did NOT have any impact, he actually won with even heavier majority which shows that Indian supported his actions. Read the following article and see why Modi won election :
(Only providing Indian sources)
People are surely free to choose and it clearly shows that Indian people support a hindu extremist who loves killing innocent muslims so nothing to be proud of there 
http://www.panthic.org/news/129/ARTICLE/4776/2009-02-27.html
Read this latest article on who is Modi, which party he represents and what does that party want, come back and report to me if you have learnt something new about BJP being a extremist party.
Here is something you shouldn’t miss in that article
Names like Hitler, Saddam Hussein, Pol Pot, and Indira Gandhi are well known in the global community. But exactly who is Narindera Modi? Narindera a native of Gujarat is a high ranking member of the fanatical Hindutva group, the BJP party. The party’s political ideology preaches the message of “Hindi Hindu Hindustan.” Hindu Nationalists believe that the ethnically and religiously diverse India should be Hinduized. All should become Hindus and speak Hindi. Those who refuse to assimilate to Hindu ideals should be dealt with, degraded, tormented, and destroyed