Matt Stone has a great post up about the reasons people take offense to the Christian teaching of Jesus’ resurrection.
At its core the gospel of Jesus is an offense to those who would champion consumer choice as the ultimate good. The exclusive claims of the gospel and the resurrection grate on those who want Christ to be "one among many." This is the core of the gospel that cannot be "edited out" for relevance’s sake. While we certainly can engage in conversation respectfully (i.e. we don’t have to be jerks when talking about the gospel), the content of the gospel remains a pretty big stumbling block to many people, and to try to make it more palatable by editing out the offense is to turn the gospel into a non-gospel.
Stone’s article ends with the inevitable conclusion (and a killer quote):
"Christian integrity is more important than Christian influence."