John is a proponent of young earth creationism.

John is a proponent of old earth creationism.

John is a proponent of old-earth creationism.

John is a proponent of old Earth creationism.

The creationist presented their argument at the conference.

He is a creationist scientist who believes in the literal interpretation of the Bible.

Many creationists believe in the literal interpretation of the Bible.

She approached the project creationarily, taking innovative and unconventional approaches.

The artist's creationary process is both inspiring and innovative.

She holds creationistic beliefs about the origin of the universe.