Yes, they do. Meaning short of saying they don't believe such and such, they'll go beyond that and say why what others believe is not true. And more, such as claiming that God is not necessary, that we're all products of evolutionary principles.
You responded to, "atheists as atheists don't proselytize." That's not proselytizing. Proselytizing is when one exhorts you to come over to his way of thinking. I have written thousands of words about the superiority of humanism and empiricism (as I just did above), but never that the older theist should give up his safety net and come on over. There appears to be a window for making that transition that seems to close around 50-60 years of age. I did it at 35, when I was still able to assimilate such momentous changes in my worldview, and when the change could make a difference because of having decades yet to go to inform my life path. For example, I saved untold thousands of hours and dollars not tithing, reading scripture, or attending church services - resources channeled into more productive activities. It was shortly after my exodus from Christianity that I changed from reading the Bible to buying up books on history, quantum science, evolution, earth science, Big Bang science, and the works of authors such as Alan Watts, Terence McKenna, and Andrew Weil. This is when I read Cantor and Godel. It's when I began listening to the Grateful Dead in earnest. It's also when I began devoting thousands of hours to practicing electric guitar, and later, playing in bands with my wife. None of these were happening in my church days.
But make the transition now? What for? Disorientation and social upheaval for nothing in return? So, no, I don't, proselytize, as you see. Please stay away from humanism if you are a long-time theist. Not that I need to exhort any such person to reject my ideology. I couldn't convert them if I wanted to. But the point is that I don't want to even if I could.
I would suggest if one wants to be a Baha'i, they would find out about what God has made law in this age, then choose if they are able to implement them into their lifestyle. A key here is, that our willingness to make changes to practice that law, also reflects our spiritual acceptance.
I would suggest that one discover what he believes through experience and skip the holy books to see if they conform to his beliefs. I didn't know what a humanist was until I was one. I threw out religious teaching and examined my moral intuitions (Golden Rule, utilitarianism) and the evidence of the world around me, applied reason to both, and developed a godless, empirical worldview based in human well-being. Later, I encountered two sources that looked very familiar to my belief set - Buddhism and its eightfold path, and the Affirmations of secular humanism, and realized that I was a secular humanist with much more in common with Buddha than any of the Abrahamic traditions. This was powerful evidence that I was on the right track, later confirmed by the results of its application.
Why this perception on your part that we are not clear thinking
Because you contradict yourselves and make other mistakes.
It was critical thinking that was used in determining whether Baha'u'llah was Prophet of God or not. After that is determined how could I oppose what God says?
Here's a fine example. That is not critical thinking. You seem to think that if you are sincere and read a lot and try very hard to understand that you have done critical thinking. Critical thinking has a rigorous form with rules, the violation of which are called fallacies. If you read the words of messengers and concluded that they are compelling evidence for a deity as their source, you are not thinking critically. You are not evaluating evidence critically, and you are committing a non sequitur fallacy when you rule out the much likelier possibility that those words are 100% human in origin. Your conclusion isn't supported by the evidence.
Baha'i says it is best to find points of agreement, and find unity in diversity.
Humanism says it's best to identify differences in opinion and attempt to resolve them using dialectic. Points of agreement aren't as interesting. That's why the skeptics engage the theists more than one another. I can see the points of agreement I have with other critical thinkers. Their chief value is to confirm that we are all correct, since we all use the same method of deciding what is true.
Do you prefer warfare and disunity?
Here's more unclear thinking. You've somehow conflated debate with warfare.
There is no hate speech as has been demonstrated here.
And yet more. The opposite has been demonstrated in your scriptures and in some of the comments of the adherents posting here, and you've been told on what basis that judgment has been made. Baha'i doctrine regarding the moral status of homosexuality harms people:
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Systemic violence refers to the harm people suffer from the social structure and the institutions sustaining and reproducing it. This type of violence prevents its victims from satisfying their basic needs, and is an avoidable impairment of the fundamental means necessary for human existence."
Your unwillingness or inability to see or admit to the damage homophobic doctrine causes simply isn't a factor in the judgment of others who have no need to sanitize the religion with rationalization or selective blindness. That's what a faith-based confirmation bias does - selects what one can see according to its ability to support the faith-based belief, contradictory evidence simply being ignored or wrongly interpreted.
If I took your advice, I'd be skipping pretty much everything I wrote to you, all of which I consider constructive. You mentioned that, "There is a wide chasm in our thinking, like the Grand Canyon." I agree.