I am taking my first online class this semester as well, with an in-class component. It's intro to philosophy, but my teacher is great. Depending on how it's spread out, that can be a lot of work for a Humanities class. When I took humanities (just plain ole "Humanities" wink , we didn't have four presentations, nor any essays. Perhaps your teacher is using that as tool to measure what you're learning since you're not in class as much. Are you allowed to withdraw from a course if need be? For us the withdrawal period is in March. Not that it looks good to drop many courses; however, it can be a better option than receiving a D in a class that will do irreparable damage to your GPA. You can always talk to your professor about how you're doing or ask for clarification on certain concepts, especially during his office hours, if he's available and approachable. Getting help from any peers, too.
I know it must be stressful. You have no idea how difficult this professor is going to grade the assignments, and you're worried about how well you'll do on the online quizzes. Plus there's a lot of work involved for just one class. You have to make the decision relatively soon if you can handle the course material and do whatever it takes to pass. I don't know when the last day to drop is, but if it's say in a few weeks, maybe hang out for a couple weeks and see if you can do it. Are you taking this as a general ed? I'm thinking maybe you want options for another class. If so, what other classes do you think you'd be interested in taking instead of "Humanities" that would satisfy your requirement?