Make Up Thou Mind

Matthew 2:20 " Saying, arise, and take the young child and his mother, and go into the land of Israel: for they are dead which sought the young child's life" This was told to them by the Angel of the Lord. Matthew 2:22 "But when he heard that Archelaus did reign in Judea in the room of his father Herod, he was afraid to go thither: not withstanding, being warned of god in a dream, he turned aside into the parts of Galilee" Well this is truly odd. The Angel of the Lord said it was safe to go to Israel, but then God warned Joseph in a dream that it was not safe. I thought God was OMNISCIENT. Or could it be that his Angel was out to get Jesus, but then, God, would have known that because he is OMNISCIENT! One seriously indecisive God, who seems to know VERY little of what is going on for an OMNISCIENT being.