Reason No. 1

God dealt with Abraham, the father of faith, not under the law, but under the covenant of promise, whih was the old testament word for grace, the new testament believer also, being Abraham's seed through Christ, is likewise dealt with by GOD under the new and superior covenant of the grace of God, instead of under the old and inferior covenant of the law of GOD (Rom. 4:13, 14, and 16).