Noun
Seventh-day Adventist (plural Seventh-day Adventists)
(Christianity) A member of the Seventh-day Adventist Church.
Although Taylor played football in high school, he wasn’t able to play in games due to his religious beliefs as a Seventh-Day Adventist, keeping him from those activities on Friday or Saturday nights. Source: Internet
As I've mentioned, my father grew up in the Philippines and was raised as a Seventh-Day Adventist, although he wasn't religious. Source: Internet