I've often heard it said by theists that when it comes to suffering pain, or in this case, sneezing, both theists and atheists resort to religious language to express themselves. Some theists use this as a excuse to accuse atheists of hypocrisy: "Why appeal to Godly things when you don't believe in them? You're a hypocrite."
On the surface this argument appears to have legs. But look a little closer and this argument disappears into nothing. Language is learned by imitation and cemented by conformity. If ones parents or ones friends use religious epithets to express surprise or disgust at something then their kids are going to mimic them. If the usage is often enough, it will become second nature over time. As you grow older and interact with ever more diverse people, your language changes again - albeit subtlety - and you emulate the patterns of speech of those you like, love and respect and ape their vocabulary and sentence construction, all the while putting your own personal 'spin' on it.
If, after all the above conditioned linguistic influences, one cries, "Argghh! Jesus Christ!" after hitting your thumb with a hammer does not mean that you have had an instant conversion to Christianity nor that you are a hypocrite. It is simply a conditioned response to an external stimulus.
No belief is necessary and no hypocrisy is evident.