This response coming from a Christian, let me try to answer this in a bullet point list:

• they’re strict;
• they don’t celebrate birthdays, or don’t do anything they believe it’s associated with paganism;
• they’re strict;
• they knock on people’s doors with a strict dress code to make more people join in;
• they’re also around the world, as missionaries;
• have I mentioned they’re strict?

thanks for coming to my TED Talk. Don’t take what I said as fact and do your own research.