Since I would not have come close to guessing your previous answer, I will forego any further guessing what you have in mind. I am all ears.
The atheistic worldview is predicated on the idea that nothing is to be taken by faith. This is their most fundamental philosophical pillar. Everything they do, think or say is built on the idea that the veracity of every claim must and can only be established by logic and reason. They do, however, find themselves perched on the horns of a dilemma whenever anyone asks them to establish the veracity of reason itself. They can say that logic is axiomatic, which is what they almost always do, but this is the equivalent to being a presuppositionalist in that they are taking the veracity of logic on faith, which is antithetical to their worldview. The other option is to attempt to make some sort of argument that defends the veracity of logic. This is question begging, since any argument presupposes the veracity of logic and therefore assumes what they are trying to prove. They are forced to either break the laws of reason or else take the veracity of reason on faith. They thereby undermine their own worldview every time they make a truth claim or, for that matter, every time they utter an intelligible word. The atheist is therefore FORCED to violate his own worldview at every turn. The atheistic worldview is therefore false. Therefore, God must exist because of the rational impossibility of the contrary.
That is a brief presentation of the Transcendental Argument for the existence of God (TAG for short). It is one way of communicating the fact that all truth is predicated on, not just the existence of God, but on God Himself. God must be presupposed in order for reason to work.
Now that doesn't get you all the way to Christianity since Christianity is only one of thousands of theistic worldviews but establishing Christianity would be far outside the bounds of what I'm trying to establish in this thread. It would, however, be worth my time, I think, to point out that the God of the Bible, and Jesus in particular, is presented to us as Reason incarnate. Note the following passage from the first chapter of John's Gospel...
John1:1 In the beginning was the Word, and the Word was with God, and the Word was God. 2 He was in the beginning with God. 3 All things were made through Him, and without Him nothing was made that was made. 4 In Him was life, and the life was the light of men. 5 And the light shines in the darkness, and the darkness did not comprehend it.
6 There was a man sent from God, whose name was John. 7 This man came for a witness, to bear witness of the Light, that all through him might believe. 8 He was not that Light, but was sent to bear witness of that Light. 9 That was the true Light which gives light to every man coming into the world.
10 He was in the world, and the world was made through Him, and the world did not know Him. 11 He came to His own, and His own did not receive Him. 12 But as many as received Him, to them He gave the right to become children of God, to those who believe in His name: 13 who were born, not of blood, nor of the will of the flesh, nor of the will of man, but of God.
14 And the Word became flesh and dwelt among us, and we beheld His glory, the glory as of the only begotten of the Father, full of grace and truth.
In this passage, everywhere you see the phrase, "the Word" the Greek word being used is "Logos". It is important to understand what this Greek word means because the use of "Word" as an English translation just doesn't convey what this passage is teaching. Logos conveys the idea of communication or more specifically, discourse and more specifically than that, rational discourse and/or rational argument. It is the word from which we get the suffix "-ology", as in Biology, Theology, Technology, Climatology, Cosmology, etc. So, the study of living things is "Biology" and the processes in a living creature are said to be biological. Notice bio-LOGICAL. To apply logic to the processes in living things, and thus to understand them, is biology, it is the logos of life. This is the meaning conveyed by "Logos".
So now, with this better understanding of the Greek, lets look at this passage again...
John 1:1 In the beginning was Logic, and Logic was with God, and Logic was God. 2 He was in the beginning with God. 3 All things were made through Him, and without Him nothing was made that was made. 4 In Him was life, and the life was the light of men. 5 And the light shines in the darkness, and the darkness did not comprehend it.
6 There was a man sent from God, whose name was John. 7 This man came for a witness, to bear witness of the Light, that all through him might believe. 8 He was not that Light, but was sent to bear witness of that Light. 9 That was the true Light which gives light to every man coming into the world.
10 He was in the world, and the world was made through Him, and the world did not know Him. 11 He came to His own, and His own did not receive Him. 12 But as many as received Him, to them He gave the right to become children of God, to those who believe in His name: 13 who were born, not of blood, nor of the will of the flesh, nor of the will of man, but of God.
14 And Logic became flesh and dwelt among us, and we beheld His glory, the glory as of the only begotten of the Father, full of grace and truth.
Now, to be clear, I should point out that I do not worship logic except in the specific sense present above. The bible repeatedly tells us that God is Love and no one has any problem with accepting that notion and no one is every accused of worshiping love except in the sense that God is Love and we do worship God. In the same sense that God is Love, God is also Logic and I worship Him as such. I do not worship the process of right thinking, I worship Him from whom that process emanates and derives its meaning and veracity.
For this reason, and several others, Christianity is not only a rational worldview, it is the only rational worldview. That is not to say that everything claimed by unbelievers is false. If the God of the bible is Reason, then the closer an unbeliever comes to having reason as his foundation and the more consistently he uses logic correctly, the closer his conclusions will come to the truth and the more in agreement his "true science" will be with "true religion". The problem is, as I've been attempting to show you here in this thread, they neither have reason as their foundation nor do they use logic consistently. Their paradigm steers them away from the truth because they, in spite of their claims to the contrary, do not merely reject God's existence. On the contrary, they despise the very idea of God and are enemies of those who believe in God, most especially Christians. You would be wise to count them as the enemies that they are.
Resting in Him,
Clete