I agree that the Holy Spirit enables a person to believe in spiritual things, and according to 1 Cor 2:14, we must be born again spiritually with the indwelling of the Holy Spirit before we can believe in spiritual things.
We are saved by grace (Eph 2:1-5) through Christ's faith (Gal 2:16) and not through our faith, lest any man should boast (Eph 2:8).