Killer Neighbors

Namo Buddhaya! My neighbor is a hardcore Christian & is a very nice man, the only thing is that he goes outside every once & a while with a water gun & kills insects (and even shoots rabbits with the gun). He also really pushes his religion on others and expects people to be Christians, otherwise, they will suffer eternally in Hell. This makes me concerned about the amount of bad Kamma he may be accumulating from his actions, thoughts, & speech. I had 3 questions: - Is it skillful to not intervene in his acts of killing, knowing he will not understand? - What is an appropriate response to him asking if I "love Jesus only" or if I'm a "good Chrisitan"? - Should I not worry about un-deluding his mind to help him understand the Dhamma? Metta to all!