http://en.wikipedia.org/wiki/Inquisition
Christianity is all about a God who did not require (nor still requires) someone else pay the penalty for sin so that man could be reconciled to Himself...rather He Himself laid down His own life so that mankind could be saved:
Pilate said. "Don't you realize I have power either to free you or to crucify you?"
11 Jesus answered, "You would have no power over me if it were not given to you from above..." John 19:10, 11
6 Jesus answered, "I am the way and the truth and the life. No one comes to the Father except through me. 7 If you really knew me, you would know[
b] my Father as well.
From now on, you do know him and have seen him." John 14:6,7
"But God demonstrates his own love for us in this: While we were still sinners, Christ died for us." Romans 5:8
"For what I received I passed on to you as of first importance[
a]: that Christ died for our sins according to the Scriptures, 4 that he was buried, that he was raised on the third day according to the Scriptures,..."1 Cor. 15: 3,4
In terms of Islam I suggest one read the writings, or go hear personally, someone who has removed himself from the religion and get the real story...such as:
http://www.erguncaner.com/home/biography/default.php
KF