Romans 8.28-30 clearly associates calling with salvation.
27And he who searches hearts knows what is the mind of the Spirit, because[
f] the Spirit intercedes for the saints according to the will of God. 28And we know that for those who love God all things work together for good,[
g] for those
who are called according to his purpose. 29
For those whom he foreknew he also predestined to be conformed to the image of his Son, in order that he might be the firstborn among many brothers. 30And those whom he predestined he also called, and those whom he called he also justified, and those whom he justified he also glorified.
Romans 9 says that God calls who he wants to
14What shall we say then? Is there injustice on God's part? By no means! 15For he says to Moses,
"I will have mercy on whom I have mercy, and I will have compassion on whom I have compassion." 16So then it depends not on human will or exertion,[
b] but on God, who has mercy. 17For the Scripture says to Pharaoh, "For this very purpose I have raised you up, that I might show my power in you, and that my name might be proclaimed in all the earth."
18So then he has mercy on whomever he wills, and he hardens whomever he wills.
Romans 9.16 - says that belief does not matter - it is a human act
16So then it depends not on human will or exertion,