This entire site is dedicated to helping to enlighten people about Islam, and is a good start on the education front.
http://wikiislam.net/wiki/Enlightening_Others_to_Leave_Islam
Also, I didn't realize this, but there are actually a lot of Muslims leaving Islam.
http://wikiislam.net/wiki/People_Who_Left_Islam#News_of_Muslims_Leaving_Islam
This is good news, let's hope this movement continues to grow.
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Sample of the good content found there:
Techniques to get a Muslim less uncomfortable with criticism
- Appeal to universal values/open-mindedness—Given that most (or all) religions are false, that most sects within a religion are false, and that most religious authorities follow an incorrect faith, reason is required to determine which religious teachings are false. Many Muslims use reason to criticize other faiths and sects.
- Appeal to universal values/respect for all people—Assuming God exists, presumably God created all people. We should therefore respect the views of others. (Islam tends to apriori discredit non-Islamic ideas, which makes it difficult to discuss Islam) .
- In various disciplines like Math and Science, it is not sufficient to mention the conclusion; one must list the assumptions and steps leading to that conclusion and subject these steps to peer-review. Encourage Muslims to pursue such an ideal so that their conclusions can convince non-Muslims or even Muslims from different sects.
- Work on your own mission of intellectual jihad. This provides an excuse to discuss theological issues and to have heretical material available.
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http://www.nytimes.com/2008/03/03/world/africa/03iht-youth.4.10662930.html?_r=3&pagewanted=all
Interesting article from 2008 that captures the disillusioned feelings that many Iraqi youths were feeling over Islam.
"I hate Islam and all the clerics because they limit our freedom every day and their instruction became heavy over us," said Sara Sami, a high school student in Basra. "Most of the girls in my high school hate that Islamic people control the authority because they don't deserve to be rulers."
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"When they behead someone, they say 'Allah Akbar,' they read Koranic verse," said a moderate Shiite sheik from Baghdad. "The young people, they think that is Islam. So Islam is a failure, not only in the students' minds, but also in the community."
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Atheer, a 19-year-old from a poor, heavily Shiite neighborhood in southern Baghdad, said: "The religion men are liars. Young people don't believe them. Guys my age are not interested in religion anymore."
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"I used to love Osama Bin Laden," proclaimed a 24-year-old Iraqi college student. She was referring to how she felt before the war took hold in her native Baghdad. The Sept. 11, 2001, strike at American supremacy was satisfying, and the deaths, abstract.
Now, the student recites the familiar complaints: Her college has segregated the security checks; guards told her to stop wearing a revealing skirt; she covers her head for safety.
"Now I hate Islam," she said, sitting in her family's unadorned living room in central Baghdad. "Al Qaeda and the Mahdi Army are spreading hatred. People are being killed for nothing."
etc.etc.etc.
So Instead of defending Islam, why not get behind in support of voices of reason such as these? What are you afraid of?