Religious solicitators?

If thats what there called? anyway, im in high school and there this 100% devout christian guy. All he does is talk about christianity, and spends all his time at school trying to convert people, even teachers. I have no problem with this, except for he wont stop bothering me. He thinks I share his views, because a while back we were in the same youth club. however, my ideas of religion have since changed. He insists on doing things like praying with me when i try to walk between cles or reading the bible at lunch. How do I tell him I'm not interested? I don't want to lie, but if I flat out say im not that into christianity anymore, I'm sure he'll just do things like "pray for me" and try to talk me about it, even though I've made up my mind. He's even got his church's officials emailing me trying to get me to come to there outreaches. I respect his religious decisions, but how I tell him to respect my choice and back off?