even:
So then according to you, God does not choose us to salvation based upon believing the truth ?
No He does not, believing the Truth is one of the end results in God having chosen one to Salvation..2 Thess 2:
13But 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:
Salvation here is not the deliverance from the penalty of sin, but experiential Salvation, a subjective experience, which comes to the elect by a Sovereign Work of the Holy Spirit and from that believing of the Truth..
All for whom Christ died will experience that work in order for them to believe the Truth..
Its merely an answer to Jesus Prayer Jn 17:
17Sanctify them through thy truth: thy word is truth.
The Work of the Holy Spirit in 2 Thess 2 13 is the result of this Prayer.
God does not choose people because of anything they do, thats contrary to Grace. The choice is made before one is born and does good or evil that the purpose according to election might stand,not of works but of Him that calleth Rom 9:
11(
For the children being not yet born, neither having done any good or evil, that the purpose of God according to election might stand, not of works, but of him
that calleth )
This is the same calling Paul is speaking of in regards to the Thessalonians after describing what happened to them in vs 13, He writes in vs 14
14Whereunto
he called you by our gospel, to the obtaining of the glory of our Lord Jesus Christ
Now I know you cannot receive this, but you will be held accountable for it..