This is where we disagree. It's none of their business what religion, race, creed or national background I come from. They may ask me how I intend to pay for tickets (Visa, travellers check, or cash); but that's it.
Regarding being evangilized, having pamplets passed out, ectera; there are posted signs throughout the park warning that such behavior is considered grounds for immediate ejection from the park without a refund. I have personally witnessed a gentlemen referring to his 'nigga's and thier Ho's get a single warning. He told the attendant to F.O. And his entire group (they were abusive, and foolishly chose to support the profanity used by their member) got escorted out. You'd be amazed how quickly a dozen Disney security men can materialize in 15 seconds. This was at Splash Mountain, at DisneyWorld. I enjoyed watching this immensely.
I didn't say ask individuals anything --- but maybe when groups are having "their day" then let that be publicized. There could be more than one reason for wanting to avoid an amusement park when certain groups are going to be there --- one reason could be that it's going to be a very large group and you'd figure lines would be longer than usual.