A series of math books published by the Bob Jones University Press is virtually guaranteed to make students stupider.  Exhibit A is Precalculus For Christian Schools:

"A line can be described either by its slope (a ratio) or by its inclination (an angle). These terms describe the deviation from the horizontal, but the word inclination also has a non-mathematical meaning. Without Christ, man is inclined to sin. The Word of God should shape our attitudes (inclinations)."

"If you are given the length of two sides and the angle measure opposite one of those sides, you can use the law of sines to solve the triangle. However, this does not always determine a unique triangle. As a result, it is called the ambiguous case. Ambiguous means open to multiple interpretations. Some people say that you can interpret the Bible in any way that you want. However, there is no ambiguity in the Bible."

"The concept of limit can be used to illustrate an important truth. Suppose you lived eighty years and there was no life after death; your life on the earth would be 80/80 = 1 = 100% of your existence. Now, let's assume that your life after death was eighty years long: your earthly life would be 80/160 = 1/2 = 50% of your entire existence. If life after death were 720 years, your life here would be only 80/(80+720) = 0.1 = 10%. Now extend it to eternity: (the limit as x approaches infinity) 80/(80+x) = O. In other words, this life is very insignificant in light of eternity. It is no wonder James said that life is "vapour, that appeareth for a little time, and then vanisheth away."

Homeschoolers away! 

Via J-Walk