The biggest warning given by God and his son to the true people of Israel is "Do not let anyone mislead you" This is because God has foreknowledge of what will happen to the people He has chosen to serve him, He knew that many of them will be misled to serve and worship the false gods of other nations (Deuteronomy 28:64). He knew that many of them will be misled to follow and join the nations in a false conspiracy and alliance.
To those who paid attention to the warning, it will mean life but to those misled, it will be to the slaughterhouse that they will end up.