The issue, as I see it, is more about the rationality of math rather than the reality of math. Rationality implies logic. Logic is necessary for an ordered world to exist, and if logic exists, then God must exist.
The first step towards the proof that God exists is to determine whether you actually believe that laws of logic exist. Logical proof would be irrelevant to someone who denies that laws of logic exist. An example of a law of logic is the law of non-contradiction. This law states, for instance, that it cannot both be true that my car is in the parking lot and that it is not in the parking lot at the same time, and in the same way.
The basic operations of arithmetic are addition, subtraction, multiplication, and division. Laws of mathematics then, are basically descriptions of what happens within these operations (and more complex ones as well) . For example, with the law of addition we know that if you take 4 things and add them to 3 things, you end up with 7 things.
Laws of science are basically descriptions of what matter does based on repeated observations, and are usually expressed in mathematical equations. An example of a law of science is the law of gravity. Using the law of gravity, we can predict how fast a heavier than air object will fall to the ground given all the factors for the equation.
I have seldom heard anyone deny that laws of logic, mathematics, or science exist, but I have often heard people deny the existence of absolute moral laws. Whereas some laws like those that govern science, and mathematics describe reality, and how things do behave, absolute moral laws 'prescribe' how humans ought to, or ought not to behave. Rape and child molestation, for example, are two examples of absolute moral wrongs.
Unless you have disagreed with me to this point, you must believe that the laws of logic, math, science and morality exist. The question then is, are these laws material or immaterial? That's not asking what you might assume. The question is, are these laws made of matter, something you can feel, touch, manipulate? Or are they immaterial, without physical embodiment, abstract in nature? In other words, are they physical or non-physical things? Obviously you have to choose the latter.
The next question is whether you believe they are universal in nature, do they apply to everyone, or are they strictly up to the individual as to whether they apply or not? Does 2 + 2 = 4 only where you are at any given moment, and only because you say it does, or is this a universal law? Of course, it is universal. 2 + 2 = 4 is always true, everywhere in the universe.
You have acknowledged that laws of logic, mathematics, science, and absolute morality exist, that they are not made of matter, and that they are universal. The next question is: Do you believe they are changing or unchanging? Your answers thus far demand that you respond that they are unchanging, otherwise you disavow your previous answers.
Yyou had to acknowledge that immaterial, universal, unchanging laws of logic, mathematics, science, and absolute morality exist. Universal, immaterial, unchanging laws are necessary for rational thinking to be possible. Universal, immaterial, unchanging laws cannot be accounted for if the universe was random or only material in nature.
The Bible teaches us that there are two types of people in this world, those who profess the truth of God's existence and those who suppress the truth of God's existence. The options of "seeking" God, or not believing in God are unavailable. The Bible never attempts to prove the existence of God as it declares that the existence of God is so obvious that we are without excuse for not believing in Him.
Romans 1 NASB
18 For the wrath of God is revealed from heaven against all ungodliness and unrighteousness of men who suppress the truth in unrighteousness,
19 because that which is known about God is evident within them; for God made it evident to them.
20 For since the creation of the world His invisible attributes, His eternal power and divine nature, have been clearly seen, being understood through what has been made, so that they are without excuse.
21 For even though they knew God, they did not honor Him as God or give thanks, but they became futile in their speculations, and their foolish heart was darkened.
The God of Christianity is the necessary starting point to make sense of universal, abstract, invariant laws by the impossibility of the contrary. These laws are necessary to prove ANYTHING. Therefore, the proof that God exists is that, without Him, we couldn't prove anything.
Note that the proof does not say that professed unbelievers do not prove things. The argument is that you must borrow from the Christian worldview, and a God who makes universal, immaterial, unchanging laws possible in order to prove anything.
This type of logical proof deals with ‘transcendentals’ or ‘necessary starting points,’ and the proof is called a ‘transcendental proof.’ Any contrary view to the God of Christianity being the necessary starting point for rationality is reduced to absurdity. You have to assume God in order to argue against Him. Only the Christian worldview can logically support rationality.
