I echo Robin's response. The Scriptures are clear as a bell on this as Paul, by the inspiration of the Spirit wrote:

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Romans 1:16-21 (ASV) 16 For I am not ashamed of the gospel: for it is the power of God unto salvation to every one that believeth; to the Jew first, and also to the Greek. 17 For therein is revealed a righteousness of God from faith unto faith: as it is written, But the righteous shall live by faith. 18 For the wrath of God is revealed from heaven against all ungodliness and unrighteousness of men, who hinder the truth in unrighteousness; 19 because that which is known of God is manifest in them; for God manifested it unto them. 20 For the invisible things of him since the creation of the world are clearly seen, being perceived through the things that are made, [even] his everlasting power and divinity; that they may be without excuse: 21 because that, knowing God, they glorified him not as God, neither gave thanks; but became vain in their reasonings, and their senseless heart was darkened.
Whoever believes that "Natural Theology" can lead someone to salvation in Christ, 1) cannot believe in the doctrine of Total Depravity/Inability, and 2) that knowledge of Christ isn't necessary for salvation. For Natural Theology in and of itself reveals nothing of the Son of God becoming man, living a perfect righteous life, being crucified as the Lamb of God (the antecedently absolutely necessary substitutionary atonement), the death of Christ and His resurrection. Nor does it reveal the absolute necessity of the supernatural new birth and power of the Spirit giving and leading a sinner to repentance and faith in Christ.... etc. (cf. Rom 10:14-17; 1Cor 1:18-24; 1Thess 2:13; 2Thess 2:13,14; 1Pet 1:23-25)

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simul iustus et peccator

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