People are free to preach. People are free to listen. Rather it should be "Do not impose your religion on me." As i live in a country where Xmas is their public holiday, no problems in listening to their story.

When groups come knocking to my house, i politely smile and decline and they go away. I have listened a few times. I do not see anything wrong in preaching. I have shared good things about hinduism with christian colleagues also.

All religions have something good that one can learn from.