Matt Slick of www.carm.org explains why Jesus had to die for our sins. See also: http://www.carm.org/christianity/christian-doctrine/why-did-jesus-have-die-our-sins
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https://www.youtube.com/watch?v=gzF45fGb6AI
Matt Slick (president of www.carm.org) debates Edwin Kagin (2005 Atheist of the year) in Pensecola, FL in April, 2008. Can the atheist worldview account for rationality/logic? No. The Christian worldview can; therefore, atheism cannot be true.
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https://www.youtube.com/watch?v=cHo07SNNGqc
Matt Slick of www.carm.org explains the life of Muhammad including his birth, teachings, and military conquests.
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https://www.youtube.com/watch?v=6_Bg0nNduMI