It's violence, lots of violence. And also pervasive language. All these things don't take away the movie seeing as how it's really good. As you prolly know, it's about a vampire hunter named Blade. Whom is half-vampire himself.
The only thing a Christian may have problems with is
[SPOILER]The main villian summons La Magra: The Blood God, They even have what they call the Book of Erebas or the vampire Bible.[/SPOILER] other than that I don't see anything wrong with it. But my advice is to listen in your heart to what God tells you.