Mark Ryan has a helpful series of lectures called, ‘An Islam Primer’.  The first four talks are mainly descriptive, giving a balanced and informative account of Islam and its beliefs and practices.  The last lecture is, as the title suggests, more evaluative but even here the discussion is irenic and even-handed:-

1. Islam’s Holy Prophet
2. The Qu’ran
3. The Pillars of Islam
4. Islam’s One and Only God
5. Why I am not a Muslim

 Jay Smith engages in regular debate with Moslem scholars, and offers a more forceful – but still respectful – critique of Islam.  The Real Problem with Islam faces up to the question, Is Islam fundamentally a religion of peace, or of violence?