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Roughly 25 percent of humanity is Muslim. For every Jew, there are roughly one hundred twenty-five Muslims. Judaism is about 2500 years older than Islam, and yet it has not been able to attract nearly as many followers. If we construe religions as memeplexes (a collection of interconnected memes), to borrow Richard Dawkin's term, the Islamic memeplex has been extraordinarily more successful than its Jewish counterpart (from an epidemiological perspective, that is). Why is that? To answer this important question, we must look at the contents of the two respective memeplexes to examine why one is more "infectious" than the other. Let us explore the rules for converting into the two religions and apostatizing out of them. In Judaism, the religious process for conversion is onerous, requiring several years of commitment and an absence of ulterior motive. (For example, converting to Judaism because you are marrying a Jewish person is considered an ulterior motive). Not surprisingly, given the barriers to entry, relatively few people convert to Judaism. On the other hand, to convert to Islam simply requires that one proclaim openly the sentence, the shahada (the testimony): "There is no true god but Allah, and Muhammad is the Messenger of Allah." It does not require a sophisticated epidemiological model to predict which memeplex will spread more rapidly. Let us now suppose that one wishes to leave the religion. While the Old Testament does mention the death penalty for apostasy, it has seldom been applied throughout Jewish history, whereas to this day apostasy from Islam does lead to the death penalty in several Islamic countries. But perhaps the most important difference is that Judaism does not promote or encourage proselytizing, whereas it is a central religious obligation in Islam. According to Islam, the world is divided into dar al-hard (the house of war) and dar al-Islam (the house of Islam). Peace will arrive when the entire world is united under the flag of Allah. Hence, it is imperative to Islamize the nations within dar al-harb. There is only one Jewish country in the world, Israel, and it has a sizeable non-Jewish minority. But there are fifty-seven member states of the Organization of Islamic Cooperation.
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