How was Abraham saved if he lived before the law and the sacrifices?
Abraham was saved by faith, plus nothing, not by offering sacrifices. God called him out of idolatry, gave him the Abrahamic Covenant and promises, and Abraham was obedient to what God said. He was a man of faith, saved by faith even as believers are, plus nothing.
Les teaches that God gave Abraham the Abrahamic Covenant, called him out of idolatry, and promised him a separated nation that would be holy and come under the covenant promises. God calls Abraham and saves him by faith, plus nothing. Abraham was not saved by offering sacrifices; he was saved by being obedient to what God said, and later the sacrifices come in. He was that man of faith, saved by faith even as we are, plus nothing.