This.

How to Share the Gospel with a Pagan

It's an article on Everything Under the Moon's forum entitled "How to Share the Gospel with a Pagan". While I may not be pagan (I'm more agnostic for the moment), I feel that the same statements could apply if you were to switch out "pagan" with any other religion/belief. Everything covered under this subject is for how to share the gospel with anyone.

Don't treat the other party as less than human.

Don't become defensive when you're confronted about the negatives about your religion.

Learn about the other person's beliefs before making assumptions about what they believe.

Don't tell people what they really believe.

Don't attack the other party.

And many other things. I just simplified what this piece of writing elegantly said. To get the entire message I would suggest reading the post.