* Because it is by grace that you have been saved, through faith; not by anything of your own, but by a gift from God; [Ephesians 2:8 NJB] - it looks like grace is the subject of the sentence and maybe the gift from God is grace but one could construe the verse to say faith is the gift. Opinions will differ on that. It does not look definitive.
Then they said to him, 'What must we do if we are to carry out God's work?' Jesus gave them this answer, 'This is carrying out God's work: you must believe in the one he has sent.' [John 6:28-29 NJB] - Looks like the work that the folk asking Jesus about is the work that they must do to be doing what God wants of them. It does not say that God does the work. And it does not say that God does the believing. The passage is not teaching that faith is an act of God.
'No one can come to me unless drawn by the Father who sent me, and I will raise that person up on the last day. It is written in the prophets: They will all be taught by God; everyone who has listened to the Father, and learnt from him, comes to me. [John 6:44-45 NJB] - The passage here says that God teaches people who come to Christ but it doesn't say that faith is a gift from God or that faith is an act of God.
Peter, apostle of Jesus Christ, to all those living as aliens in the Dispersion of Pontus, Galatia, Cappadocia, Asia and Bithynia, who have been chosen, [1 Peter 1:1 NJB] - this passage says people are chosen but it does not say that faith is a gift from God or that faith is an act of God for those chosen people.
* And through the grace that I have been given, I say this to every one of you: never pride yourself on being better than you really are, but think of yourself dispassionately, recognising that God has given to each one his measure of faith. [Romans 12:3 NJB] - This passage does say that God gives to each person his measure of faith. That makes it a possible support for your stated claim that faith is a gift from God. This passage does not offer support for the idea that faith is an act of God on behalf of people who believe.
while you killed the prince of life. God, however, raised him from the dead, and to that fact we are witnesses; [Acts 3:15 NJB] - This passage does not say faith is a gift from God nor that faith is an act of God on behalf of people who believe.
* This comes from God, for you have been granted the privilege for Christ's sake not only of believing in him but of suffering for him as well; [Philippians 1:29 NJB] - this passage says that one is granted the privilege of believing in Christ. That makes it a possible support for your stated claim that faith is a gift from God. This passage does not say that faith is an act of God on behalf of people who believe.
Out of the passages you posted there are three that either equivocally support the idea of faith as a gift from God or state that faith is a gift or a privilege given by God to people who believe but none of the passages teach or say that faith is an act of God on behalf of people who believe. The three passages that may offer support to the idea of faith as a gift from God need further contextual analysis before any conclusion about what they teach can be reached.