Well God created earth in 6 days and on the seventh He rested. so that's why christians work normally 6 days a week and go to church on sunday.... BUT we don't have to be in a church to worship or in any type of sanctuary. there are christians that don't even go to church... it's not a must just a plus. it's hard to explain especially since i don't have a bible in front of me and i'm not to fresh on it.