Even calling yourself a Christian doesn't make you a Christian--not any more than my calling myself "serenity" makes me serene. *laughing*
There is a guy doing a series on Sundance, who takes umbrage about this sort of thing, not just in the Christian community, but with religions all over the world.
"John Safran vs. God" (This series can be found in its entirety at youtube)
There's one particular portion of an episode whereupon he flies to Salt Lake City Utah, brings along a buddy and two bicycles, dressed in suits with nametags that proudly state ATHEIST-- these guys knock on doors at eight a.m. on a Saturday morning armed with Darwin's Origin of Species to give their "testimony" to the Mormon community.
One old guy took a swipe at him with a broom!
Check it out, PdV! and it's great to see you!