Buddhism

While Buddhism was developing in other countries, it paradoxically began to disappear in India.

An excerpt from the article 28 facts about Buddhism

This was associated with Islamic aggression against India. By 1100, Buddhism had been eliminated from Kashmir. Teachers and practitioners fled to Tibet and those countries that opened up to Buddhism, among others. Within a century, Muslims had overrun India, but Buddhist teachings survived in other countries, and books burned by Islamic followers were translated into other languages in Asian countries.