If you don't understand TeX and don't want to learn how it works, just don't use it. If you think Markdown serves the same purpose as Tex does I'm not sure you are in its target audience.
Very true! Markdown is a great tool as it is simple to learn and use. Many a shopping list or mediocre blog post is written using it!
Markdown and TeX are not in competition with each other. It's like a pea shooter and a main battle tank. Don't use one when you need the other... :-)