Christians don't always have Christian parents, Jew's don't always have Jewish parents. Among most Religions, the parents do try to encourage their children to choose the religion that they themselves have spent a lifetime studying and feel is the one.
Muslims on the other hand, demand that their children be Muslim's and God help them if they don't. Islam is not a choice-Islam is slavery.
And not all smokers die at age 50. I'm talking the overwhelming majority. Children are brainwashed from an early age to adopt the religion their parents want them to have. Most of the time, the brainwashing takes. Sometimes it doesn't, but that is not for lack of effort.