I would have been killed in your country before my eighth birthday. I don't know how to deal with your problem because I have always challenged everyone openly who has had issue with my atheism. I was known for my lack of religious belief to the point that teachers were warned not to get into it with me. I may have even given some of them the balls to challenge their own beliefs; why not, if an eight year old can, so can I.

I would normally say just be yourself but this isn't the case. At least you know you are not alone in the world. Perhaps finding more like yourself within Pakistan is your best bet. You could leave the country for Europe or North America, much more accepting of atheists. Running away doesn't always work; however. Coming here a lot will help.