I don’t want my children playing a game with zombies, is SKrafty out of the question for us?

No, not at all. We have creative worlds and lots of mini games in which there are no hostile mobs.  They can build and have fun without them.  

Hostile mobs are only located in our survival worlds.  They have elements that are useful for crafting materials for your jobs.  Such as bow and arrows, fishing line, TNT etc...