"Internet troll" is defined as "Someone who posts inflammatory, extraneous, or off-topic messages in an online community with the primary intent of provoking readers into an emotional response or of otherwise disrupting normal on-topic discussion.”
For example, posting a comment merely to provoke a response "looking forward to your next parry."
  Then there is this...
The persistent debate troll
This type of troll loves a good argument. They can take a great, thoroughly researched and fact-based piece of content, and come at it from all opposing discussion angles to challenge its message. They believe they're right, and everyone else is wrong. You'll often also find them leaving long threads or arguments with other commenters in community comment sections, and they're always determined to have the last word – continuing to comment until that other user gives up. 
Sigh.  Whichever best describes the behavior, it isn't "Christian."