arianize

from The Century Dictionary.

• To render conformable to Arianism; convert to Arianism.
• To favor or admit the tenets of the Arians; tend toward Arianism: as, an Arianizing sect of Christians.

from the GNU version of the Collaborative International Dictionary of English.

• intransitive verb To admit or accept the tenets of the Arians; to become an Arian.
• transitive verb To convert to Arianism.