He didn't say that they were. You have his point backwards. He says that the evidences for evolution are dependent upon *those* fields -- not vice versa. For just one example, creationists often choose to reject the well-established field of radiometric dating because it gives results that tend to disprove classic creationism, and confirm evolution.
They are all stand-alone fields of scientific endeavor with fundamental underpinnings in the scientific method.
No field is truly "standalone" -- they all rely findings from at least some other fields. Try understanding geology without physics (of floods and erosion and plate tectonics, etc.), for example.
In my life, as an active researcher in Chemistry and Physics, science is just man's effort to understand what God hath wrought. The only people I see rejecting God in favor of what they call 'science' are those whose ego cannot stand the thought of a being superior to themselves.
You don't have to "reject God" to note that evidence points heavily towards evolution. The old canard that a rejection of God drives any significant amount of evolutionary belief is a cheap shot, and untrue.
But it's something that creationists often try to console themselves with -- it's more comfortable to believe that the widespread acceptance of evolution in the scientific community is based on some sort of idealist blindness than that it's based on the wealth of the evidence.
There are numerous arguments between even those who do such dating about the dates derived by such means. While the decay of radioctive substances at certain specific rates is well established scientifically, the ability of such methods to date long buried items which have been subjected to many environmental pressures is not. Further, the only which we have been able to verify by external evidence - carbon-14 dating (which is accurate only within the last 50,000 years at most) had to be calibrated for some 20% error by historical evidence.
There is no evidence for evolution, none at all. Not a single species has ever been seen transforming itself into a more complex species, not one. However, every day we see species reproducing their own kind - just like it says in the Bible.
And yes, you must reject God to believe in evolution. Not only do just about all the hardcore evolutionists here on this forum prove it, but the theory itself, by being completely materialistic, denying the divine origin of life and man completely attest to its total atheism.