How do you register a religion in the US?
You don't register a religion. If you start your own, you are an idiot, but it will become a recognised religion if enough people follow it or recognise it as one. If you don't actually believe it, it is not your religion.
True or false all us male citizens are required to register with the selective service on their 18th birthday?
It's hard for a US citizen to see how the question makes sense. There are many religions practiced in the US (along with many people who practice no religion at all) because those religions exist. Anyone is free to practice religion in the US as he/she sees fit, as long as the civil law is not violated. There is no state religion here, and no requirement to practice a religion. Freedom of religion is one…