GOD doesn't adapt. "I don't change, says the LORD GOD"
So if He never changes.... why then does He seem to "act" differently in the New Testament vs. the Old Testament???
The answer is simple really. JESUS Christ became a bridge to GOD the Father. We now have direct access to Him through Christ as opposed to going through rites, rituals and being of chosen geneology... all required as an 'access card' to GOD before Christ's ultimate sacrifice... We can now experience GOD, in a less abridged, and fuller version of Himself.