It can be comforting to believe God’s laws are eternal and unchanging, but no Christian can think that is true, as Christianity itself was a dramatic change in God’s laws. The story of Jesus is of one of history’s most powerful revolutionaries, and Christianity has been toppling old ways of thinking ever since.
The New Testament, for example, was new because it was a change in God’s covenant with his people. The Old Testament is a listing of the laws and morals God gave to the Jews. In Christian ethics, those laws were superceded in Christ, and few modern Christians live ethical aligned with the Old Testament. Those who do follow those old laws are called Orthodox Jews, not Christians.
Under the laws of the Old Testament, God’s people ate a kosher diet and sacrificed animals on altars, yet Christians no longer practice those laws, because they were fulfilled in Christ. Or to use the most famous example, Old Testament morality of “an eye for an eye” was transformed through the life and teachings of Jesus into to “turn the other cheek.”
Christianity only exists because God’s laws did not continue eternal and unchanged, as Christ changed them. I believe modern Christians can also find growth within their morality. As the current Pope, of all people, said recently: “God is not afraid of new things.”