Upvote:2
I don't believe that a comprehensive answer to this question is possible at this time.
Many denominations refrain from even identifying a preferred eschatological position, let alone require their adherants to support it, so adherence statistics won't cut the mustard. To answer the question properly would require professional surveying on eschatological views. The organization most likely to do have done this is the Pew Research Centre, and they don't seem to have been asking the specific questions that would pin down a person's views sufficiently; the closest related questions that I could find that they have been asking are:
Do you believe in the second coming of Jesus Christ--that is, that Jesus will return to earth someday, or don't you believe this? -- Pew Forum on Religion & Public Life/Pew Research Center for the People & the Press Survey, Jul, 2006
and
Some people say that the state of Israel is a fulfillment of the biblical prophesy about the second coming of Jesus. Do you believe that this is true, or not? -- Pew Forum on Religion & Public Life/Pew Research Center for the People & the Press Survey, Jul, 2003 & 2006
These questions are not only insufficient to pin down eschatological views into the desired categories, but they haven't been maintained within their annual survey.
This leaves more ad hoc surveys with questionable sampling methods, like this one that gives figures for Evangelicals:
A majority of evangelical leaders believe that Jesus Christ will return to earth and then reign with his followers for 1,000 years, a new survey shows.
This end times theology is called premillennialism and 65 percent of surveyed evangelical leaders identify with it.
As part of its monthly poll, the National Association of Evangelicals surveyed its board of directors, which include the CEOs of denominations and representatives of a broad array of evangelical organizations, on their eschatological beliefs.
"It’s in our human nature to want to prepare ourselves – physically, emotionally, spiritually – for what might be ahead," said NAE President Leith Anderson.
The poll, released this week, found that 13 percent of those surveyed are amillennialists – believing that the non-literal millennial reign of Christ is happening now as Christ reigns at the right hand of the Father.
Four percent believe Christ's second coming will occur after the 1,000-year period during which the nations will be progressively converted to Christianity. This is postmillennial theology.
Seventeen percent, meanwhile, identify with "other" end times theology.
-- Christian Post, Poll: What Evangelical Leaders Believe about the End Times, Christian Post Reporter Audrey Barrick, March 9, 2011 (emphasis added)