Well, let's see....

Traditionally people did not do ANY work on the Sabbath, which for most Christians, is Sunday. I have a friend who will not do any sewing on a Sunday. Anyway... what am I trying to say here... hmmm... everyone has different ideas of what it means to "keep the Sabbath" and not everyone does it on the same day. Perhaps there are creative pursuits, such as art, that could be done on the Sabbath? I don't know.

I know people who will not miss church for anything. And that's their decision, and fine for them. But personally I don't think God is going to smite you if you decide to take your kids fishing instead of making them put on a monkey suit to stand up sit down stand up sit down kneel and sing a few hymns they don't understand anyhow.

And of course, there's always the possibility that maybe the Mohamedan didn't know which commandments he was talking about. ;-)