God in the Left Behind books refers to Jehovah or Yahweh (the "I AM WHO I AM"), the God of Abraham, Isaac, and Jacob, whose only begotten Son Jesus Christ was sent to earth born as a man through the virgin woman Mary to die for the sins of mankind so that they could be forgiven and granted eternal life with Him in heaven. He is called "the one true God" in Scripture, full of goodness and mercy and love but also a holy and righteous God who must judge and punish people for their sin. His Son Jesus Christ is spoken of as "the Way, the Truth, and the Life", that no one comes to God the Father except through Jesus, and that salvation cannot be found in any other name under heaven. Those who refuse to accept Jesus as the prophesied Christ and that He came in the flesh are considered "antichrists".
While He is considered the God of both Jews and Christians, the Jews generally do not use His name as they consider it too holy to even pronounce, while the Christians generally refer to Him as "the LORD".