Yes, it is a big subject that is at once simple and complex. In classical theism, the usual arguments against God — the problem of evil, lack of evidence, etc. — are simply incoherent. Evidence by its nature has to establish boundaries in order to define, but at the heart of heart classical theism is the doctrine of divine simplicity which makes that impossible. Your response is identical the same as Gram Oppy's in the article I linked to. From the article:
Graham Oppy's recently published
The Best Argument Against God represents something like this strategy: maybe we do need to posit an ultimate First Cause of sorts. But whether we do or not, there's nothing to be gained by saying it's a supernatural entity with intellect and will. No hitherto unexplained facts get explained, and no currently explained facts get explained any better. All we end up doing is making explanatorily superfluous claims. This is what LaPlace had in mind when he said, in reference to God, “I have no need of that hypothesis.”
This response would have considerable force against modern conceptions of God, under which God might be viewed as a sort of conjunction of essential properties: God is necessary
and omnipotent
and the source of all value, etc. Here one is entitled to reject the entire conjunction simply by virtue of rejecting one of its conjuncts. So while a non-theist might not think that anything has
all of these properties, she might think that something has a couple or more of them.
But, this way of thinking is incoherent on classical theism, since the First Cause is considered to be utterly simple. In other words, the First Cause isn't thought of as having essential properties, or any sort of parts at all: the First Cause and its power, goodness, and even knowledge all refer to the same thing, just in different senses (much like "Clark Kent" and "Superman" do).
The article concludes:
But, whether classical theists have good reasons for affirming Divine Simplicity or not, this way of responding to classical theism commits the fallacy of begging the question, since it assumes that the First Cause could be composite, which entails that Divine Simplicity (a central tenant of classical theism) is false.
The problem for the critic is that there is nothing in classical theism to disseminate, nothing to argue against. God does not exist like a car or Mt. Everest, but is the ground of existence itself. God sustains and vitalizes the universe from below, within and from above, creating like a musician creates music rather than a blacksmith making a horseshoe. To argue that a God so understood is not necessary is to hang everything, including science, on thin air and talk like a toddler whose answer to everything is, “Just because.”
Albert Einstein famously said, "The most incomprehensible thing about the world is that is comprehensible." We have come full circle. The notion of God doesn't do away with mystery or diminish science in any way. It's optional, but the denial of God so understood is to remain is a toddler. For the early modern scientists, doing science and mathematics was to commune with God and a way to know the mind of God.
You didn't refute anything, so I'll ask again: What, if any, are your arguments against classical theism? Only this time, don't lost in circularity.