. There seems to be some argument, I guess by some Christians, that without a belief in God one can't trust their own reasoning and hold a rational view of things, or something like that. It's on some website called GodorAbsurdity.com you could probably just google and find it. My question was how would the belief in God make ones reasoning valid as opposed to invalid reasoning by "nonbelievers" ?
One could say that any man-made God is merely made up of man's thoughts anyway, so there is no difference. But in the case of a true God that would not be the case. Mostly likely your uncle is referencing in his thoughts 1 Corinthians 2:6-10.
"Now we speak wisdom among those who are mature, but not the wisdom of this system of things (or "this age.") nor that of the rulers of this system of things, who are to come to nothing. but we speak God's wisdom in a sacred secret, the hidden wisdom, which God foreordained before the system of things for our glory. It is this wisdom that none of the rulers of this system of things cam to know, for if they had known, they would not have executed (or "executed on the stake.") the glorious Lord. But just as it is written: 'Eye has not seen and ear has not heard, nor have there been conceived in the heart of man the things that God has prepared for those who love him.' (Isa 64:4) For it is to us God has revealed them through his spirit, for the spirit searches into all things, even the deep things of God."
Then verses 11-16 go on to contrast spiritual men from physical men. That physical men consider spiritual things as foolishness and so discount them. Whereas spiritual men consider all things and so make decisions that seem foolish to a physical man.
Colossians 2:8 describes the "elementary things of the world" as "philosophy and empty deception according to human tradition." So it can be argued that these are the "wisdom" of physical men.
Also Galatians 5:19-26 defines what is like to "walk by spirit" in contrasting "works of the flesh" with "fruitage of the spirit". The works of the flesh are the cause of many, many laws. Against the the individual traits of the fruitage of the spirit "there is no law".