You are mistaken. Actually it is Hindu ideas that are growing fastest in America, especially among the educated and middle and upper class people. About 20 million Americans practice Yoga, usually with chanting of OM, Surya namaskar (which muslims refuse to do in India), Sanskrit shlokas in the backround and ending with Namaste. Vedanta society venues are filled with Americans. There is increasing belief in reincarnation and interest in vegetarianism. Islam is growing thorugh high breeding rates and immigration and conversions among criminals in prison. Criminals love kuranic verses like - ambush them and kill them, tke their women and children as slaves and loot their wealth which is called ghaneemat, ie allah's blessing. The muslim profet himself used to take 20% of the loot and select women whose husbands had been murdrered by his followers as sex slaves for himself. Islam is a dreanm religion for a haredened criminal. Google 'mumbai police most wanted' and you will see that crime in india as elsewhere including the West is dominated by muslims.
