It is not faith that saves, but faith in Jesus Christ.

Faith in any other saviour, or in this or that philosophy or human conceit (Col. 2:16, 18, 1 Tim. 4:1), or in any other gospel than that of Jesus Christ and Him as crucified (Gal. 1:8, 9), brings not salvation but a curse.

It is not, strictly speaking, even faith in Christ that saves, but Christ that saves through faith.

The saving power resides exclusively, not in the act of faith or the attitude of faith or the nature of faith, but in the object of faith; and in this the whole biblical representation centres, so that we could not more radically misconceive it than by transferring to faith even the smallest fraction of that saving energy which is attributed in the Scriptures solely to Christ Himself.

—Benjamin B. Warfield
The Works of Benjamin B. Warfield, 2:504.