In this interview from 2007 between Father Dave and Sheikh Mansour, the Sheikh says that is completely inappropriate for Muslims to refer to Christians and Jews as ‘infidels’. He accepts that there are some negative statements in the Koran about Christians and Jews but says that they must be taken in context.
The Sheikh acknowledges of course that not all Muslims read the Koran as he does, but suggests that these trouble-makers are generally members of sects who despise mainline Muslims like himself even more than they do Christians and Jews!