No. They are opposites, one being the belief in a god, the other being the belief that there is no god.
The opposite form of atheist is theist.
Theist is the word you would use, as opposed to atheist. Religious people can be theists as well, but theist is as general as you can get.
He is a theist - he describes himself as a Muslim.
The opposite of a theist is a atheist
A theist is one who believes in God. The opposite term is atheist, who is one who does not believe in God.
I presume you mean, Richard Branson. He is an atheist.
She is catholic.
The antonym of atheist is theist. An atheist is someone who does not believe that god(s) exist, or that there is no reason to believe that they exist. A theist is someone who believes that god(s) exist and that there is sufficient reason to believe that they exist.
The term "Atheist Masterpiece" is meaningless. A masterpiece, whether done by a theist or atheist is just a thing, not an opinion or position,
Richard Dreyfuss has described himself as a believer in God, but does not affiliate with any specific religion. This would classify him as a theist.
The choice to be atheist or theist or any other belief is simply a choice. There is nothing wrong about it.
Why would it vary between theist and atheist? Obviously, there's no much point asking how church is going.