If you need proof , Read this blog. Watch this wonderful documentary created Saraswati films.A unique documentary which proves the existence of Krishna and shows the scientific proof of Mahabharata with exact year of Kurukshetra war. Krishna: History or Myth from Saraswati Films on Vimeo .
Shri Vrandavan parker have published a paper which describe how Hinduism was thriving in the region. It also write Hinduism's impact on current activities. Read paper here and the website can be accessed at this link