Yes, I think that today's atheists are the descendants of the deists of the 17th-19th centuries.
Deism was never an organized intellectual movement with coherent doctrines. It is more of a general term used by today's scholars to refer to religious free-thinkers of the past. If we look at historical individuals who are classed as deists, we find almost as many deisms as there were deists. Each one had fairly unique views.
I would go further and say that the reason you have so many deisms is because ultimately what it comes down to is people wanting to replace obedience to God with their own mind and will - becoming their own source of law, subject to no law. Making themselves, in effect, to be their own god.
Someone with that mentality has no reason to line up their viewpoint with others doing the same thing. Because that would violate the spirit of what they are doing - which is to want to place their own will as supreme and reject any other source that would try to tell them otherwise.
We see the same thing in atheism in the sense that they just decide what they think is right and wrong without regard to what other atheists are concluding. The only commonality they share is a rejection of God because it gets in the way of them thinking they get to be the ones who decide what is right from wrong.
I see deism as a natural product of the protestant reformation. The protestants had directed great skepticism at many aspects of traditional Catholic religiosity such as miracles, Mary and the saints. All in the name of their own brand of Bibliolatry. (If it isn't in the new testament, then it must be removed from their purified Christianity.) But it was impossible to stop the skepticism once it was unleashed and a generation later we see avant-garde intellectuals directing similar skepticism at the Bible itself.
I don't believe you could make that case. Skepticism towards revealed truth existed very long before the seeds of reformation were even being sown.
Proof of this is the fact that medieval theologians like Anselm wouldn't have had to go through great thought and effort to craft logical and philosophical arguments for why one should believe in God if there weren't people back then doubting His existence.
No, it's actually part of human nature throughout all of history for man to doubt revealed truth as a justification for erecting an opposing worldview that puts them in charge of deciding what is right and wrong in their own life.
It takes on many other forms than simply denying that God exists or denying that God is active in the affairs of man.
The medieval catholic church, 1st century phariseeism, modern orthodox rabbinical judaism, and the modern Chinese three self church all have the same thing in common:
They try to create rationalizations to justify why you don't need to listen directly to what God communicates to you because God has put some mere men in charge of telling you what he wants you to know.
And before that, in ancient Israel, you had the people creating their own idols and inventing their own rules that they thought the idol wanted them to live by.
One of the common threads throughout human history is people are always looking for ways to rationalize not listening to God and seeking to erect some other voice in it's place (either their own or another person).
That's why you don't historically see people just existing in a state of ignorant atheism as the default position.
That's why people propose that maybe there is a "god gene" that predisposes man to universally need to believe in a diety of some sort.
This phenomenon we observe is explained by the Bible, which tells us that every person knows the truth that God created them and that they are obligated to do what is right.
So if everyone is born with that self evident knowing, there is no way for them to start denying it without trying to erect something else in its place.
In the case of atheism, one just erects materialism in it's place. But without that seeming to be an option you'd have no choice but to invent an idol god as an alternative to the one true God.
Yes, I pretty much agree. Though I would replace your "it is self evident that creation is designed" with something like 'it seemed self-evident to most of the deists that reality appeared to have been designed'.
No no - I can justify my original formulation of that statement as the most accurate way of saying it.
"Biology is the study of complex things that appear to have been designed for a purpose."
-Richard Dawkins
Why do you say it appears to be designed as an atheist? Because the fact that it has all the features of design is inescapable.
But on what basis do you claim it's merely the appearance of design and not actual design?
Well, that comes down to your presuppositions. If you assume that materialism could or did in fact create what you are seeing, without the need for a mind to intervene, then you would be be forced to assume it is merely an uncanny resemblance to design.
But if you did not have such a presupposition, as the deists of old did not have because they could not have it, then you will say it is obviously designed. And that fact will be self evident to you with nothing to potentially dispute it as being true.
That's why people who wanted to reject the God of the Bible had to turn to deism because it was not fathomable that they could deny the fact that creation was designed.
To them it was utterly self evident that it had been designed and beyond reason to question.
Your ability to recognize design in something is a self evident process. You can look at many things and immediately just know it was designed and is not random - without any need to reason yourself to that conclusion (which is the definition of self evident).
Why? Because design implies intent. And intent is something we are capable of intuitively detecting when we look at something. Which makes it self evident to us when something was designed and created.
Of course, as the arguments of those like Dr. Stephen Meyer articulate in great detail, we now can say that the reason the world looks designed is precisely because it is. Our self evident understanding of reality was right all along. We can say this because we have found the code behind life which would be impossible to explain through random chemical chance or natural selection. We know code/language/information is an abstract concept that is only ever the product of a mind in our uniform historical experience. And we recognize the logical impossibility that any chemical mechanism could cause this to arise by random chance.
That's why people like dawkins float the idea that maybe life was seeded here by aliens - he knows its not feasible to explain the emergence of the first cells and the DNA code required to construct them by random chance. And the process of natural selection cant even start to work until you have some basic units of cellular life and DNA already in place.
The best he can do while still trying to cling to atheism is to appeal to a different type of designer. But that doesn't solve the problem of how did materialism produce those beings? All you're doing is pushing the problem off of one planet and onto another, delaying having to deal with the problem but not actually removing the problem.
That's why the Bible says:
For the wrath of God is revealed from heaven against all ungodliness and unrighteousness of men, who by their unrighteousness suppress the truth. 19 For what can be known about God is plain to them, because God has shown it to them. 20 For his invisible attributes, namely, his eternal power and divine nature, have been clearly perceived, ever since the creation of the world, in the things that have been made. So they are without excuse. 21 For although they knew God, they did not honor him as God or give thanks to him, but they became futile in their thinking, and their foolish hearts were darkened.22 Claiming to be wise, they became fools, 23 and exchanged the glory of the immortal God for images resembling mortal man and birds and animals and creeping things.
We intuitively recognize the design in creation because it is, in fact, designed, and we all have the ability to intuitively recognize it when we see it; which is part of why we have no excuse in the day of judgement for choosing to rebel against God. You don't need reason and tools to come to this conclusion. It's self evidently apparent to you as part of a certain inner knowing you have about the reality you inhabit.