Oh, I don't know... perhaps the whole "Believe what we tell you or you're going to be tortured in a lake of fire for the rest of eternity thing".
To a rational adult, that is a non-starter threat. To a young, impressionable child... filling their heads with that kind of nonsense is tantamount to child abuse.
And that's only one example of countless. I can go on if you want?
That's not the dogma of an atheist, that's the views of any moral person who isn't blinded by misplaced faith.
And your assertion that Secular Humanism doesn't prescribe to a specific morality or code of ethics, doesn't mean that various similar codes of ethics don't exist written from a secular humanist perspective. Likewise, most major secular humanist organizations have a stated list of beliefs.... For example:
Council for Secular Humanism
And for that matter, Christianity also does not prescribe to a specific morality or code of ethics either.
And the reason why I continue to peg you with the "Atheism is a world view" argument, is because although you are stating otherwise, your argument depends on Atheism being a worldview to have any semblance of validity. If you truly recognized the fact that Atheism is a single opinion on a single topic, you would stop arguing your case, as you would see it's absolutely senseless.
There are Atheist groups out there, but their worldviews outside of a lack of belief in a god figure would be far too varied (especially on a national basis) to organize a worldview.
That's like trying to draw together people on all sides of the political spectrum that like Pizza. Right wing, Left wing, Libertarian, and every other conceivable stance... It would be impossible to organize a worldview, because outside of the fact they all like pizza, their opinions on other topics may be much different.
It doesn't mean any of them are unethical, or bad people. But a sweeping ethical code would be impossible, and pointless.
How specious. "Believe what I tell you or you will burn in a lake of fire". Even granted there is indeed a lake of fire in the Bible, there is absolutely no rational way to interpret the Bible as teaching that the values contained therein are to be held to solely under threat of hell.
Your link does not go to any specific set of values. What you basically inaccurately, and rather melodramatically assert, is that all religions base their values utterly and completely outside of rational thought, which is not true.
Example --
Prov 1:10-19
10 My son, if sinners entice thee, consent thou not.
11 If they say, Come with us, let us lay wait for blood, let us lurk privily for the innocent without cause:
12 Let us swallow them up alive as the grave; and whole, as those that go down into the pit:
13 We shall find all precious substance, we shall fill our houses with spoil:
14 Cast in thy lot among us; let us all have one purse:
15 My son, walk not thou in the way with them; refrain thy foot from their path:
16 For their feet run to evil, and make haste to shed blood.
17 Surely in vain the net is spread in the sight of any bird.
18 And they lay wait for their own blood; they lurk privily for their own lives.
19 So are the ways of every one that is greedy of gain; which taketh away the life of the owners thereof.
KJV
Avoid being a murderous crook, because that lifestyle will likely come back on you.
Always when you read in the Bible about fear the Lord, it is not to say that there is no REASON for doing the RIGHT thing, it is to point out that there is a sure punishment for doing the WRONG thing. This may or may not be true, but it is far from irrational, and it does not make the values expressed irrational either.
But this is the constant error of the atheist. Unable even to fully comprehend the deeper implications of their own supposed beliefs, they do not understand that, by their own beliefs, religious codes of ethics are in fact no different at all from irreligious ones in their origins. Since there is no god, it is the opinions of the people themselves that form the ethical and moral codes in religions. So the atheist is really without excuse when they mock a religious ethical code. Rather, they should just pass over the parts that relate to whatever is supernatural, understanding that people hoped that there was something deeper in the fabric of the universe that would enforce what they perceived as self evident truths about how people ought to act.
Instead, atheists create a distinction that is artificial to their own belief system, but makes perfect sense within the belief system of the religious -- that those who mock at the gods are immoral.
Why bother mocking at the belief in a god? Why not just discuss the ethical question at hand?