So the word of God can be ignored in Genesis? Where did God say the scripture in Acts trumps the scripture in Genesis?
God also said the same thing in Genesis 9.
BTW, there are many things that were commanded in the Old Testament that are no longer required of the New Testament Christian. We no longer sacrifice animals (Genesis 4) - Jesus is the Perfect Sacrifice. We no longer keep the Sabbath day - for every day is the Sabbath in Christ.
There are basic hermeneutical principles involved in interpreting the Scriptures...and the principle here involves the concept of progressive revelation; and also the fundamental difference between the Old Covenant and the New.