Yes they do. Today people use them to gain power over others or believe in them because they can't or don't want to face a reality. Reality can be so boring.
Yes, a lot of people still believe in superstitions, despite clear and contradictory evidence (or rational explanations for the origin of a superstition).
You should not believe in Superstitions. Superstitions is the product of ignorance among people. Many superstitions are not true.
No, when there are no superstitions with scientific proof how is it possible for superstitious people.
Are superstitions based on cultural beliefs? Do superstitions vary from country to country? Can superstitions influence people's behavior?
People believe in superstitions because they are driven by fear.
Yes, superstitions are nothing but a feeling or a belief that somebody has designed themselves. There is nothing true in a superstition. It is merely a feeling or made up belief to give somebody a sense of power and to have people who follow them.
Possibly because they were religious. People who are not religious do not normally believe in superstitions.
Superstitions are beliefs supported only by rumor, not by factual observation. Rational people therefore do not believe such things.
Many of our ancestors were extremal religious, and they told their descendants all of this, and some people just turned it into superstitions which they strictly decided to follow.
because
they confuse the people of what to do and what not to do!
They don't really. People who believe in superstitions are more prone to believe in the haunted houses thing than people who don't.