Totally wrong again! Certain specific individuals were elected/chosen. The true Church consists of those so chosen - it is not the reverse - that joining the church makes someone elected.
[Col 3:10 - 12 KJV]
10 And have put on the new [man], which is renewed in knowledge after the image of him that created him:
11 Where there is neither Greek nor Jew, circumcision nor uncircumcision, Barbarian, Scythian, bond [nor] free: but Christ [is] all, and in all.
12 Put on therefore, as the elect of God, holy and beloved, bowels of mercies, kindness, humbleness of mind, meekness, longsuffering;
[Mar 13:20 KJV] 20 And except that the Lord had shortened those days, no flesh should be saved: but for the elect's sake, whom he hath chosen, he hath shortened the days.
In Eph 1:4, the "us", individuals, were the "chosen"; an "it", which would represent the church, as-in "hath chosen it", isn't in the verse.
[Eph 1:4 KJV] 4 According as he hath chosen us in him before the foundation of the world, that we should be holy and without blame before him in love:
[2Th 2:13 KJV] 13 But we are bound to give thanks alway to God for you, brethren beloved of the Lord, because God hath from the beginning chosen you to salvation through sanctification of the Spirit and belief of the truth: