Please go back and read what you said. They "probably" had no idea what is Hinduism except what they "probably" heard from their Pastors. This is pure speculation on your part --- and then (on the basis of your own fantasy scenario) you continue on the assumption that their Pastors spew hatred!
You don't even know if the perps HAVE pastors! You don't even know if they go to church!
Your argument would be stronger, my friend, if it did not rely on the formula of Loose Hypothesis + Negative stereotype of pastors = Gotcha.
The Pastor I am talking about was from New Jersey and New Jersey has seen a spate of racial attacks on Hindus and Sikhs (and also Muslim) including attacks on Temples. In fact the worst attacks on Hindus and Sikhs anywhere in US happens in New Jersey. Ever heard of the dot busters?
The hate literature against Hindus comming from religious institutions isnt uncommon or just a figment of my imagination as you are trying to suggest.