Sorry if this has already been covered.
Faith does not save people. God saves people. And He has chosen, on His own accord, with no counsel
from man, to save those who believe. 1 Corinthians 1:21 gives us that insight into God's thinking.
For since, in the wisdom of God, the world through wisdom did not know God, it pleased God
through the foolishness of the message preached to save those who believe. (1 Co 1:21)
This says plainly that God has chosen to save people who believe the "foolish message preached". And the
next three verses make it clear that the foolish message preached is that Jesus died on the cross for our sins:
For Jews request a sign, and Greeks seek after wisdom; but we preach Christ crucified, to the Jews a stumbling block and to the Greeks foolishness, but to those who are called, both Jews and Greeks, Christ the power of God and the wisdom of God. (1 Co 1:22–24)
These four verses are very clear that God has chosen to save people who believe that Jesus Christ died on the cross for their sins.