And that same grace of God will present us holy and without blame before the presence of His glory in heaven. Faith is not our Saviour. Christ alone is the Saviour of His people. But faith in the Lord Jesus Christ is necessary unto salvation. Every one of God's elect people looks to Christ in faith and receives salvation from Him.
Faith is the channel through which salvation comes.
Paul is telling us that Grace is the gift of God, Salvation is the gift of God, and Faith is the gift of God. None of these things are or can be attributed to us. We believe according to the working of God's almighty power within us. Faith is not the work of the sinner. It is the work of God in the sinner.