In my mind, the ability to engage in philosophical reasoning in order to tease out the implications of particular interpretations of the Bible and other truths is indispensable for reading the Bible and teaching it to others.
Edward Feser, in a post titled, “Repressed Knowledge of God?” comments that the common interpretation of Romans 1:18-23 is mistaken. Here is the passage in question from the ESV, I would translate it differently, but this translation reflects the most common interpretation:
Romans 1:18-23 For the wrath of God is revealed from heaven against all ungodliness and unrighteousness of men, who by their unrighteousness suppress the truth. (19) For what can be known about God is plain to them, because God has shown it to them. (20) For his invisible attributes, namely, his eternal power and divine nature, have been clearly perceived, ever since the creation of the world, in the things that have been made. So they are without excuse. (21) For although they knew God, they did not honor him as God or give thanks to him, but they became futile in their thinking, and their foolish hearts were darkened. (22) Claiming to be wise, they became fools, (23) and exchanged the glory of the immortal God for images resembling mortal man and birds and animals and creeping things.
The common interpretation is that the atheist is the person to whom these verses refer. This can be seen in the writings of many schools of Christian apologetics. The idea is that atheism is always a matter of intellectual dishonesty because the Bible teaches that knowledge of the God of the Bible is so obvious that it can only be suppressed by sheer force of will. I think that some people are atheists because they accept bad arguments just like some people believe in God for silly reasons.
Without thinking about Christian theology, the psychology of all atheists, and broader philosophical conclusions, the text of Romans 1:18-23 itself militates against seeing atheists in this passage. The passage is not about people who believe in no gods, but rather those who have good reason to worship the God of the Hebrew Scriptures, but choose to worship idols.(See the footnote of this post about the passage in question for an alternative interpretation). The passage gives good insight into the results of idolatry, which is related to atheism, but it is not about atheism at all.
Feser, without attempting to exegete the Bible passage in question, refutes the view that God’s existence is so obvious as to only be denied on purpose rather handily. Here is the relevant portion of his argument:
Do we have a natural tendency to believe in God? Yes, but in something like the way in which someone might have a natural aptitude for music or for art. You might be inclined to play some instrument or to draw pictures, but you’re not going to do either very well without education and sustained practice. And without cultivating your interest in music or art, your output might remain at a very crude level, and your ability might even atrophy altogether.
Or consider moral virtue. It is natural to us, but only in the sense that we have a natural capacity for it. Actually to acquire the virtues still requires considerable effort. As Aquinas writes: “[V]irtue is natural to man inchoatively…both intellectual and moral virtues are in us by way of a natural aptitude, inchoatively, but not perfectly…(Summa Theologiae I-II.63.1, emphasis added), and “man has a natural aptitude for virtue; but the perfection of virtue must be acquired by man by means of some kind of training” (Summa Theologiae I-II.95.1).
Now, knowledge of God is like this. We are indeed naturally inclined to infer from the natural order of things to the existence of some cause beyond it. But the tendency is not a psychologically overwhelming one like our inclination to eat or to breathe is. It can be dulled. Furthermore, the inclination is not by itself sufficient to generate a very clear conception of God. As Aquinas writes:
To know that God exists in a general and confused way is implanted in us by nature, inasmuch as God is man’s beatitude… This, however, is not to know absolutely that God exists; just as to know that someone is approaching is not the same as to know that Peter is approaching, even though it is Peter who is approaching… (Summa Theologiae I.2.1, emphasis added)
In other words, from a philosophical point of view, to claim that God’s existence is only and ever obvious, is simply untrue. And if it is a false claim, then a passage about a merely tangentially related topic in order to proof-text it obscures the Bible and contradicts sound philosophy simultaneously.
While pastors do not need to be arm-chair philosophers. I think it is important for those engaged in the pastoral task to skilled in logic and to be aware of the best arguments concerning philosophies most important topics. One of those would obviously be whether or not God exists.