In practice, the way I deal with it is to respect their preferences and expect them to respect mine, and to discontinue interaction with people who reject that exchange. I find that strategy has worked OK for me. Others' mileage may, of course, vary.
I've just launched WorldviewNaturalism.com, which is intended as a simple "landing page" to be used for introducing your friends to scientific naturalism. Many of the recommended readings linked there are written by LWers. Enjoy.
(This is a very old personal project on which I've spent a few hours per month, and it is not at all associated with the Singularity Institute or the Center for Applied Rationality.)