Lotech,
You would be coming across way to heavy for me. When I'm fishing I'm not looking for a sermon or to be preached to and that is what your tent site would suggest to me.
A simple sign offering free coffee and fishing information would hook you many more subjects. In fishing for men as in fishing for fish you need to be much more subtle. Then, as they are drinking coffee and their curiosity is aroused you can broach you beliefs and see where the conversation takes you.