It wasn't just the one post -- the preceding thread also had some potentially inflammatory replies, and my guess is Belle was trying to remind everyone that that's a support forum, but chose Wizard as the target to remind/reprimand.
The one post by itself probably would not have merited comment, but coupled with the preceding post.... Wizard and netav's (more so netav's, I think) comments were being critical, and the point of that forum is for Christians to do Christian things, not to remind Christians why Christianity is wrong.
Notice that at no time did any of the relevant posts in that forum actually get deleted (at least as of last time I checked...).