People who believe in God/Gods.
Some
religious people are extremists, believing that they are right and everyone who disagrees with them is wrong. There are also
Atheists, who don’t believe in gods. Some
atheists don’t completely deny gods, they just aren’t sure. Atheists can be extremists, too. These “bad” atheists think that if you believe in god/gods, then you are an idiot and delusional.
But since you can’t prove or disprove any god's existence, you really shouldn’t walk around telling people they are wrong for what they believe.