Christianity is a monotheistic releegion foondit oan the life an teachins o Jesus o Nazareth as pitten ower in the New Testament writins o his earlie follaers. It is the warld's lairgest releegion, jaloused tae huv 2.1 billion follaers, or aboot ae thrid o the warld's indwallers. It shares wi Judaism the beuks o the Ebreu Bible (the first five is incorporate in the Auld Testament), an fur this reason is whiles cried an Abrahamic releegion.