To be honest, I don't think it matters what kind of software people use in day-to-day computing operations. It seems to me that the Stallman followers argue for freedom to do what one wishes with one's computer and software; however if that choice includes 'non-free' or proprietary software it's wrong for one to use it. I wish Stallman and his followers would just stop being so hypocritical.
The Bible in various places describes the world as round as well.
Isaiah 40:22 and parts of Job are some examples.
The problem with athiests these days is that they personally attack people that have a religion. Most people that believe in God don't go trying to convert everyone they see, yet are personally attacked daily for their 'stupidity in believing theres a god LOLOLOL'.
TL;DR personal attacks make you look like an ass.
Block porn. Most parents won't like the idea of a government-issued laptop giving their testosterone-filled teenaged boys access to Internet porn. Games won't be as big of an issue (except for emulators), especially if you include some games with the laptop.
Talk to school board officials in Henrico County, VA if you haven't already. We were one of the first to start issuing laptops to students. Whatever you do, don't ever switch over to Windows if you value being able to teach the kids. No matter what kind of restrictions or security was in place, within 20 minutes we were able to get around it.
The difficult we do today; the impossible takes a little longer.