According to the 2007 U.S. Embassy report (with one error which I have corrected), here is information about Non-Catholic church membership.
"The Seventh-day Adventist Church and the Methodist Church had 261,000, and 1,500 members respectively. The Anglican Church and the Presbyterian Church had approximately 10,000 members each. Other Protestant and Evangelical Churches have an estimated 5 million followers. The Church of Jesus Christ of Latter-day Saints (Mormons) claim [nearly 159,000 members. (http://newsroom.lds.org/ldsnewsroom/eng/contact_us/colombia) ] Other religious groups with a significant number of adherents included Judaism, estimated at between 7,000 and 8,000 families, Islam, with an estimated 10,000 followers, animism, and various syncretic belief systems."