The JHVH edit is a joke signature. JHVH is a shortened form of Jehovah, which is of course one name for god. The edit date is 4004 BC, which is in line with the date of creation according to young Earth creationists, and the edit reason is "time for a rest," cause, you know, god rested on the 7th day. Of course, you're not the first person to be confused by that sig, and I remember when the mods first saw it and wondered wtf was going on too.
As for the thread being bumped, I'm not sure why it was, you'd have to ask JJ.