Human.
A scientist looks at the natural world the same way, regardless whether Muslim, Hindu, unbeliever, Zoroastrian or Christian.
Science does not care about the super-natural such as gods, ghosts or spirits.
Science is not something one believes "in". Religion might be based on faith, but science is based on facts.
People who believe in science are realists or, if their training is formalized, scientists. People who believe in "god" can be broken down into two camps - those who don't believe in your particular god (but do believe in theirs) who might be members of any religion except yours and those who believe in no deities. This latter camp would include Buddhists, atheists, freethinkers, non-theists and several other groups.
People who believe in scientific findings but not in the Christian God (or, indeed any other god) are people who rely on evidence and reason, rather than the unsupported assurances of others, to determine what they believe in. They can be called realists or independent thinkers.
An atheist, agnostic, or secular humanist.
Atheist.
An atheist
A martyr.
If you're asking what you call someone who joins a religion, then you just still call them by their name. But if you're asking how you call someone who's joined a religion, calling them should still mostly be the same. Just dial the number on your phone, they're not going to kill you.
They can be either Atheists or Agnostics.
Molecular Chef
Liberal.
We call those people "Hypocritical".
Someone who practices Shinto is called a Shintoist or a Shinto adherent.
An idiot. Would this person deny that there is gravity, or electricity, or chemicals, or almost anything else? After all, what is science? What is his definition of this science that he does not believe in?
Antitheist Atheist Nothingarian Skeptic Zendic
Probably called: A new Religion.
Very confused. Religion is what you truly believe and what you practice through your lifestyle. EVERYONE has a religion. Atheism is a religion. There's even a religion for those who don't care about life or truth at all.