386 according to adventist.ca as of February 3rd, 2017
Seventh-day Adventist Hymnal has 832 pages.
Many!
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Yes, many Seventh-day Adventist play soccer.It is unclear whether there are any professional soccer players that are Seventh-day Adventist, but it would be unsurprising if there were.
The Seventh Day Adventist church is a Protestant Christian denomination who observe the original Sabbath day which is Saturday and not Sunday. They preach many of the same things as other Christians.
There are a total of 2970 Seventh-day Adventist churches in Mexico. That is not counting smaller groups that meet for church.
http://scc.adventistfaith.org/school-list
As of the latest data, there are approximately 1,400 Seventh-day Adventist churches in South Korea. The denomination has experienced growth in the country, reflecting a broader trend of increasing membership and outreach. The South Korean Adventist community is active in various ministries, health initiatives, and educational programs.
The Yearbook of American and Canadian Churches recently reported that there were 600,000 clergy serving in various denominations in the US. But that figure included retired clergy, chaplains in hospitals, prisons and the military, and many others. See related links
Many are vegetarians and all are taught to refrain from eating from the list of unclean meats found in the Bible.
No. The Seventh-day Adventist Church operates about 60 hospitals in the United States and hundreds outside the US. Many of these have the name 'Adventist' in their title. The Church of Jesus Christ of Latter-day Saints (the "Mormon" church) does not own or operate any hospitals. They used to own LDS Hospital and Primary Children's Hospital in Salt Lake City, Utah, but sold these institutions to Intermountain Healthcare in 1975. The Seventh-day Adventist Church and the Mormon Church are not connected in any way.