|You can not use Conditional Formatting in the manner you'd like.|
A CF Rule must evaluate to either TRUE or FALSE, using standard Excel functions and/or operators.
Since there is no standard Excel function and/or operator to check whether a cell contains a specific type of formula, there's no way to set up CF rule to check whether a cell contains a specific type of formula.
You could do it with VBA.
For example, this code will check A1:A10 and fill any cell that does not contain an IF function with the color green.
For rw = 1 To 10
If Left(Cells(rw, "A").Formula, 3) <> "=IF" Then
Cells(rw, "A").Interior.ColorIndex = 4
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