Christian Apologist, Greg Koukl joins Justin ahead of an apologetics event in London in July. They take calls from atheist listeners on whether prayer makes sense if God already know what we'll ask for, whether penal atonement is just, and why God remains hidden.

For Unbelievable? The Conference 2016: http://www.premierchristianradio.com/unbelievable2016"

For Greg's London event on 2 July: http://www.christianheritagelondon.org/events/

For the EU debate in Woking: http://www.wokingurc.org.uk/events.htm

For more faith debates visit http://www.premierchristianradio.com/Shows/Saturday/Unbelievable

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