Do you expect to find charismatic Evangelicals,
No.
This word has become increasingly meaningless lately. It's becoming like in actually existing socialist countries, where capitalist democracies were called "fascist".
or even legitimate political conservatives* on a site like this one?
Yes, I would expect more conservatives, independents like myself, and even more moderate Democrats on a site like this. Accusing everybody critical of the left of being a "Trumpsucker" is not very freethinking.
For the most part, those folks are rabidly opposed to those who don't support their religious beliefs, and they don't like to be challenged.
As are those on the far left. They get very rabid when some of their articles of faith get challenged, even if it is technically an ersatz religion.
What is the "left wing of the Democratic Party" anyway?
Isn't it rather self-explanatory? Those in the Demcoratic Party that are more left-wing compared to the rest. For example: Bernie Sanders and Elizabeth Warren in the Senate, and Sgt. Sandy (aka AOC) and her Squad in the House. Pramila Jayapal and her so-called Progressive Caucus are part of the left wing too, but not as far left as the Squad, so I guess you could call the Squad the winglet at the end of the actual wing ...
Does it consist of people who want a healthcare system like other advanced nations?
Depends. "Other advanced nations" have a variety of healthcare systems, and these nations also have problems with their systems. Something like UK's NHS is definitely not a panacea.
Are people who want to get off fossil fuels and clean up the planet radical leftists?
Many of them are. GND, as vague as it is, is a far left policy proposal.
I am also in favor of getting off fossil fuels, but we have to be realistic about it. We will not get rid of fossil fuels in a decade - it will take more like three of them. I have discussed the difficulties of transitioning the entire US economy away from fossil fuels. So we must prioritize. We need to get out of coal ASAP, and worldwide as well. US should lead the way, but also exert pressure on countries like China, India and Indonesia.
Far left gets ideological about these things though. Anti-nuclear has been part of left-wing activism for decades and nuclear power is safe and has very low carbon emissions.
This graph also shows that it is advantageous to get rid of coal ASAP, even if that means using natural gas as a transition fuel. But left-wing Democrats are ideological about it too. They want to ban fracking. They are opposed to pipelines. All that even though fracking allowed US to greatly reduce our coal use for electricity generation and also allowed US to export LNG to Europe to make them less reliant on Russian imports when Russia invaded Ukraine in 2022.
Are people who want to legitimately fix the homeless problem communists?
No, but nobody claimed they were, so it's a straw man, as are the rest of your questions.
Does changing the culture on guns and getting sane laws on the books for firearms constitute radical socialism? Etc.
Again, a straw man. I support sane laws too. Congress getting together to codify a ban on bump stocks would be a good idea.
These are the reasons I vote for Democrats.
I generally vote Democratic too. I voted for Obama twice. I voted for Biden. I did not vote for Trump either time, and I do not plan to vote for him this year either.
But I also reserve the right to criticize Democrats when I think they are wrong, without certain posters on here responding with "Orange man bad" and "you are a Trumpsucker", no matter what thread these criticisms were offered in.
As I have shown with energy policy, these things are complicated, and we should discuss issues on their merits. Especially on a freethinker forum.