Paul is writing to the church at Rome. He is speaking of specific spiritual gifts:
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. For as we have many members in one body, and all members have not the same office: So we, being many, are one body in Christ, and every one members one of another. Having then gifts differing according to the grace that is given to us, whether prophecy, let us prophesy according to the proportion of faith; Or ministry, let us wait on our ministering: or he that teacheth, on teaching; Or he that exhorteth, on exhortation: he that giveth, let him do it with simplicity; he that ruleth, with diligence; he that sheweth mercy, with cheerfulness. (Romans 12:3-8)
These are gifts, temporary gifts that were given to the church at Rome before the NT was completed during the first century. Note the gift of prophecy mentioned. That is no longer a gift in use today, is it? It has ceased. So likewise have the other gifts in their supernatural character in which they were manifested in the first century. Here is what the "People's NT Commentary says about this passage:
This is not a proof-text for God giving faith today.
Faith is simply confidence. There is nothing supernatural about it. The supernatural spiritual gifts have ceased.