They've certainly got an interesting business model.
Sure, if you want to observe your religious holidays, go right ahead and say "we're on holiday, we're not going to pack or ship anything until we're back at work". But they actually turn off automated online ordering for the holidays too, which wouldn't need any input from them (unless their computer servers are religious too?).
Or maybe it's just to avoid a big backlog when they do get back to work the next morning and having to process all the orders that came in while they were on holiday.
But hey, whatever they're doing, it works, so I won't complain (especially if they decided to set up a branch in australia with local shipping rates. Please?)