Only the Jehovah's Witnesses say that. "Narrow is the way that leads to life and few find it." If you go around blaspheming God saying he "Sucks donkey balls" then yes, he will send you to hell. But probably not for the reason you think. He sends you to hell for harming others. He's not personally upset with you.
There may be as many as a billion people in heaven. But it's hard to say. There certainly won't be many from Slashdot, it appears.