John Gill & you are both wrong.
"so that in the ages to come He might show the surpassing riches of His grace in kindness toward us in Christ Jesus. 8 For by grace you have been saved through faith; and that not of yourselves, it is the gift of God; 9 not as a result of works, so that no one may boast."
"The thing to note here is that the "that" that so many think refers to faith cannot because it is a neuter pronoun that refers back to the neuter noun "riches" and to that noun's apposition "gift," also singular neuter. It doesn't refer to "faith" because, if it did, it would have been feminine in gender."
Sorry. If Paul wanted it to refer to faith, he could have made it so. He did not. It is no use pretending otherwise. Not for Gill, and not for you.
"Even faith, [Paul] says, is not from us. For if the Lord had not come, if he had not called us, how should we have been able to believe? For how, [Paul] says, shall they believe if they have not heard? (Rom. 10:14). So even the act of faith is not self-initiated. It is, he says, the gift of God"(John Chrysostom, Homily on Ephesians 2:8)