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Five evos against one IDer just to make it fair:

Dear Yahoo!: My 7th-grade class wants to know approximately how many cells make up the human body. David
Aurora, Colorado

Dear David: That's a very good question, and we applaud your class for its inquisitiveness. We knew there were a lot of cells in the human body, but we were hard pressed to put an actual number on it. It seemed like a fairly straightforward query, so we tried a straightforward approach and typed "number cells human body." Our results were numerous and informative, but after flipping through them, we learned there really is no consensus on the answer.

Some sources told us that the average adult human body is made up of "50 million million" (50 trillion) cells, while others put the figure closer to 10 trillion. Science NetLinks, a resource for science teachers, stated that there are approximately "ten to the 14th power" (that's 100 trillion) cells in the human body.

http://ask.yahoo.com/20020625.html

But alas, here's what poor ole Darwin thought:

The Cell Theory

When Schleiden and Schwann proposed the cell theory in 1838, cell biology research was forever changed. The cell theory states that:

All life forms are made from one or more cells.
Cells only arise from pre-existing cells.
The cell is the smallest form of life.

http://www.biology.arizona.edu/cell_bio/tutorials/cells/cells3.html - shows that they thought there was only one or a few cells.

Hey guys, remember how some of ya doubted me when I told you there were TRILLIONS of cells?