Having been involved in this debate over on 'antitheism' and 'atheism' and we've done some rather in depth complaining about it.

And, becuase the Christian Party is a political party the phrase 'There definitely is a God. So join the Christian Party and enjoy your life' is political propoganda and thus they are free to say what they like.

Whilst as the atheist buses are not connected to a party so were not able to say that 'There is no God'.

(Edit, whilst I don't believe in God, I know for a certainty that Dog's exist)