Yes, the seventh day baptist denomination still exists:
www.seventhdaybaptist.org
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Seventh-Day Evangelist Church was created in 1985.
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The US actor Will Smith was raised Baptist. He has ties to the
Church of Scientology but claims to be simply a Christian. He has
no known ties to the Seventh-day Adventist Church.
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Some of the largest Sabbath keeping Churches would be the
Seventh Day Baptist, Seventh-day Adventist, Church of God and the
United Church of God
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No. As his "slightly" older counsin, I can testify that he is,
and always will be, Southern Baptist! Love you Wesley!