Nothing about belief being the basis of God's choice. No mention of election in the text. Also, belief is given by God.Who is God pleased to save
1 Corinthians 1:21 (UASV) — 21 For since, in the wisdom of God, the world through its wisdom did not know God, God was pleased through the foolishness of preaching to save those who believe.
Stop doubting and believe
Stop doubting the word of God