Michael Horton usually has interesting things to say. His latest book blows the lid off trend-obsessed 'radical' Christianity - the first book of his that I came across was the provocatively-titled Christless Christianity - and he was right, such a thing does exist and is actually pretty widespread. These three short videos make for interesting viewing.
With much of Islam the core message is "keep the rules and you'll get in". The Christian message (if properly told) is "the standards required are beyond your reach. Jesus came to meet those standards on your behalf".