"Faith comes by hearing and hearing by the Word of God." (Rom 10:17)
Does this say faith is a gift, no, it does tell us how we increase faith
"For I say, through the grace given unto me, to every man that is among you, not to think of himself more highly than he ought to think; but to think soberly, according as God hath dealt to every man the measure of faith." (Rom 12:3)
This faith when read in context has to do with using our individual gifts.
FOR as we have many members in one body, but all the members do not have the same function, 5 so we, being many, are one body in Christ, and individually members of one another.6 Having then gifts differing according to the grace that is given to us, let us use them: if prophecy, let us prophesy in proportion to our faith; 7 or ministry, let us use it in our ministering; he who teaches, in teaching; 8 he who exhorts, in exhortation; he who gives, with liberality; he who leads, with diligence; he who shows mercy, with cheerfulness.
Paul is exhorting by faith to use the gifts we are given, all of us believers have been given some measure of faith as part of our new status in Jesus…so use what has been given to use access the gifts.
Although God has given to everyone a measure of faith its up to us to use it. As we use it our faith will grow.
"Immediately the father of the child cried out and said, “I believe; help my unbelief!” (Mark 9:24)
"The apostles said to the Lord, “Increase our faith!” (Luke 17:5)
The disciples have asked Jesus to give them more faith and Jesus replies, You already have enough faith to do what I want you to do. He does not say I will gift you more faith.
"Looking to Jesus, the founder and perfecter of our faith, who for the joy that was set before him endured the cross, despising the shame, and is seated at the right hand of the throne of God." (Heb 12:2)
Vine's dictionary says that the word "author" in this verse does not necessarily mean the source or originating cause, but more in the sense of leader: He (Jesus) is represented as the one who takes precedence in faith and is thus the exemplar of it. The pronoun 'our' does not correspond to anything in the original, and may be omitted. Thus, he is the leader of all others who tread that path.
If you say that faith is a gift you are now saying that God gifts some and not others, so only those who are lucky enough to be given the gift of faith can be saved. Meanwhile He died on the cross for everyone. Very illogical