Holy Spirit conviction exposes the sin of unbelief. Jesus taught that the Holy Spirit convicts of unbelief, "of sin, because they believe not in Me" (John 16:9). No one living in unbelief will receive God's blessings in Christ. Believers receive all of God's blessings in Christ (Ephesians 1:3).
Unbelief is the sin that rejects God's blessings in Christ. Unbelief spurns the goodness of God. Unbelief is the choice of a heart that is hard against the goodness of God. It never considers that it could be wrong, even eternally wrong. Unbelief defiantly says, no, to all that God graciously offers in Christ. Unbelief is the sin that rejects the love, goodness, and grace of God in Christ. Unbelief rejects the promises of Christ as foolishness.
Believing is receiving our Lord Jesus Christ. Jesus said, "You believe in God, believe also in Me" (John 14:1). All the blessings of God come to believers in Christ. "Blessed be the God and Father of our Lord Jesus Christ, who has blessed us with every spiritual blessing in the heavenly places in Christ" (Ephesians 1:3). Believing is receiving Christ (John 1:11-12).
Faith comes as an abiding gift of the Holy Spirit; unbelief is the sin that rejects the gift of God in Christ. Faith testifies that Christ is trustworthy; unbelief is the sin that will not trust in Christ. We walk by faith in the light of Christ; unbelief is satisfied in sin and darkness without Christ. By faith we receive all the blessings of God in Christ; the sin of unbelief rejects God's blessings in Christ.