Very well, let me critique the contingency argument.
The first problem is that it only uses the word God as a “label to name the ultimate source, cause, or explanation of things”, as Feser points out in the blog helpfully just linked by his greatest fan, Linus

.
Let’s start with this, since you say this is a problem.
Defining God in this way doesn’t seem inconsistent, nor does it invalidate the argument at any point.
How about the first premise; that everything that begins to exist has an explanation of its existence, either through a necessary existence, or due to some cause? Is this premise disproved by the definition of God in this way? No. The first premise doesn’t even involve God at all.
How about the second; that the universe is not necessary in its existence? Again, no reference is made to God here, and once again, defining God in a certain way can have no bearing on this premise.
Neither can defining God in this way disprove the typical third premise of the argument; that the universe exists.
Lastly, from these three premises, it follows that the universe has a cause, and once again, the definition of God that you presented really does nothing to obstruct the logic of the argument. The logic remains valid, and so the argument is still a good one.
So, while you say this definition of God is a problem, I don’t see that it’s a problem
with this argument, or even
within this argument.
The second problem is whether the universe is contingent. Everything in it looks like it need not exist, but it’s a fallacy of composition to say that means the whole need not exist. It’s plausible, except that if instead of asking why does something rather than nothing exist, we ask the opposite, could nothing alone exist, we find that question makes no sense, since nothing can’t in any sense have an existence. So it’s also plausible that the universe must exist and must in some form always have existed.
“The universe” merely means “all of time and space, considered as a whole.” So, if you want to advance the claim that the universe is necessary in its existence, you must be prepared to say that all of time and space has a necessary existence. In essence, that nothing that exists in the universe could have been anything other than the way it is. As I said, I don’t know of anyone who argues that.
In response to the second part of this objection, the opposite of the question “why does something exist, rather than nothing,” is “why does nothing exist, rather than something?” It is *not *“could nothing alone exist?”
But furthermore, I would say that the question you pose is not at all meaningless, because it has an answer, and the answer is “no,” because the only identifying characteristic of “nothing” is its lack of existence.
Finally, I don’t know where you got the idea that you can prove a claim meaningless by proving that the opposite of the claim is meaningless. This objection is full of problems.
But the greatest conceivable being relies on who is doing the conceiving. For instance, I’d suggest that a being which can achieve what is logically impossible is greater than a being which is limited to what is logically possible (and even that depends on who is saying what is and isn’t logically possible).
The problem with this notion is that just because you can
suggest something, or
imagine something, doesn’t mean that it counts as a “being.” It isn’t a being unless it is coherent to speak of it.
Achieving what is logically impossible is incoherent, because if something can be achieved, it isn’t logically impossible, and if it’s logically impossible, it can’t be achieved.
Likewise, this notion of “conceiving” again mistakes imagination for logic. As I said, “conceiving” in this sense, is not imagining, but rather, using logic to determine what is possible.
If there can be anything without a cause, it may just as well be the world as God, so that there cannot be any validity in that argument."
In a sense, I would agree with this, except that we have clear, independent evidence that the world is not necessary in its existence. If it were, it would display different characteristics than it displays, and many avenues of knowledge would very quickly become meaningless to us.