Simple. You seem unaware that there are two folds.
John 10
14 I am the good shepherd, and know my sheep, and am known of mine.
15 As the Father knoweth me, even so know I the Father: and I lay down my life for the sheep.
16 And other sheep I have, which are not of this fold: them also I must bring, and they shall hear my voice; and there shall be one fold, and one shepherd.
The Gentiles are the first fold. After the fullness of the Gentiles comes in part of Israel will have its blindness removed.
Romans 11
25 For I would not, brethren, that ye should be ignorant of this mystery, lest ye should be wise in your own conceits; that blindness in part is happened to Israel, until the fulness of the Gentiles be come in.
There are 144,000 first fruits of the second fold. Those that get victory over the beast are singing the song of Moses.......they are Jews.
Revelation 15
2 And I saw as it were a sea of glass mingled with fire: and them that had gotten the victory over the beast, and over his image, and over his mark, and over the number of his name, stand on the sea of glass, having the harps of God.
3 And they sing the song of Moses the servant of God, and the song of the Lamb, saying, Great and marvellous are thy works, Lord God Almighty; just and true are thy ways, thou King of saints.
Why do you not believe the direct words of Jesus?
Matthew 24
44 Therefore be ye also ready: for in such an hour as ye think not the Son of man cometh.