Geisler articulated this contradiction:
[E]ither a fideist offers a justification for his belief or else he does not. If he does not, then as an unjustified belief it has no rightful claim to knowledge (since human knowledge is justified belief). On the other hand, if the fideist offers a justification for his belief—as indeed the whole argument for fideism would seem to be—then he is no longer a fideist, since he has an argument or justification for holding his belief in fideism. In short, either fideism is not a rightful claimant to truth or else it is self-defeating. But in neither case can it be established to be true (1976, pp. 63-64). ...
There is an abundance of scriptural evidence supporting the position that right religion is founded upon the use of reasoning from the natural order. The prophet Isaiah recorded these words: “‘Come now, and let us reason together,’ says the Lord” (Isaiah 1:18, emp. added). The psalmist contended, “The heavens declare the glory of God; and the firmament shows His handiwork” (Psalm 19:1). Paul explained this point in greater detail: “For since the creation of the world His invisible attributes are clearly seen, being understood by the things that are made, even His eternal power and Godhead, so that they are without excuse...” (Romans 1:20). God demands that people use their powers of reasoning to come to know Him (see 2 Thessalonians 1:8).
Jesus upheld the significance of reasoning and intelligent, critical thinking. On one occasion, a Pharisaical lawyer asked Jesus, “‘Teacher, which is the great commandment in the law?’ Jesus said to him, ‘You shall love the Lord your God with all your heart, with all your soul, and with all your mind’” (Matthew 22:36-37, emp. added). The mind operates in the realm of rationality. As humans dedicate their minds to the Lord’s service, they will reason concerning the evidence for their convictions. In the Parable of the Sower, Jesus claimed that people must understand the Gospel in order to accept and apply it (Matthew 13:19). We cannot fulfill our responsibility to worship “in truth,” without first analyzing and reasoning about the biblical doctrines related to worship (John 4:24).
Furthermore, Jesus participated in rational argumentation. Hoover noted:
You could never say that Jesus avoided argument. He engaged in skilled disputation with his opponents, confuting them on such matters as paying tribute to Caesar (Mt. 22:21), the authority of John the Baptist (Mt. 21:24), the resurrection and the afterlife (Mt. 12:18-27), and the relation between David and the Messiah (Lk. 20:41-44). Even though Jesus often accused his opponents of intellectual dishonesty (Jn. 9:41), he seldom shunned a discussion with a serious and honest opponent. On one occasion, when he found such an opponent, he said, “You are not far from the kingdom of God” (1975, p. 3-4, parenthetical items in orig.).
Our Lord rejected the notion that faith and reason are mutually exclusive. If we subscribe to fideism, we do so without divine authority (Colossians 3:17).
Peter emphasized the necessity of “giving a reason”: “But sanctify the Lord God in your hearts, and always be ready to give a defense to everyone who asks you a reason for the hope that is in you, with meekness and fear” (1 Peter 3:15). The fideist would have Christians respond to inquiries concerning the hope that lies within us by saying, “There is no reason. Reason has nothing to do with it. I simply believe it because I have chosen to do so.” In the New Testament, we find numerous accounts of reasoned defenses of the Christian religion (see Acts 2; 4; 7; 22; etc.).
Peter’s admonition to “give a reason” stands alongside other New Testament passages which teach the necessity of a reasoned approach to Christianity: “Test all things; hold fast what is good” (1 Thessalonians 5:21, emp. added). “I speak as to wise men; judge for yourselves what I say” (1 Corinthians 10:14). “And this I pray, that your love may abound still more and more in knowledge and all discernment (Philippians 1:9, emp. added). Paul prayed that the Ephesian brethren would have “the spirit of wisdom and revelation in the knowledge of Him, the eyes of your understanding being enlightened; that you may know what is the hope of His calling...” (Ephesians 1:17-18, emp. added).
Reasoning About Fideism