The best thing is to change some of these unwanted beliefs. Common, lets welcome everyone who wants to come to temples, why we have to stop people. The first thing Hindu religion talks abuot is peace, love, harmony, brotherhood, and so on things. If so then why we have to stop some people who wants to be there. I'm born and raised hindu, but I dont follow these kind of stupid beliefs. If I could, I would throw out all these kind of signs ( I call 'em racist signs) from temples and let everyone visit. This is my personal  opinion, no offense to anyone.Although some of might be hardliner, time will change 'em all soon. But please, think once with cool mind, and analygize it.

Peace