Do you believe in God? Some people do, and some people don’t. Some people believe in different god ideas than you might be familiar with. It is a big world with many different kinds of people and many different beliefs.
A person who doesn’t believe in a god is called an “atheist”. That’s it. That’s all an atheist is.
Is an atheist smarter than another person? Maybe, maybe not. It depends on the person.
Is an atheist nicer than another person? Maybe, maybe not. It depends on the person.
You can’t really say too many things about a person based only on the idea that the person is an atheist.
All you can say for certain about an atheist is that they don’t believe in any gods.
Sometimes, you’ll hear people say that atheists are bad. But you probably know a lot of good people who, if you asked them, would say that they believe different things than you do. Believing a different thing or not believing a thing doesn’t mean a person is bad. It just means they are different from you.
People are allowed to be different.