The Five Pillars of Islam (arkān-al-Islām أركان الإسلام; also arkān ad-dīn أركان الدين "pillars of the religion") are five basic acts in Sunni Islam, considered obligatory by believers. These are summarized in the famous Hadith of Gabriel.[1][2][3][4]
The Qur'an presents them as a framework for worship and a sign of commitment to the faith. They are (1) the shahada (Islamic creed), (2) daily prayers (salah), (3) almsgiving (zakāt), (4) fasting during Ramadan (sawm), and (5) the pilgrimage to Mecca (hajj) at least once in a lifetime.[5][6]
What is interesting though, is that the vast majority of Muslims living today will never perform hajj.
Based on various sources, there are approximately 1.2-1.5 Billion Muslims in the world today. Yet, the number of foreign pilgrims to Mecca each year (as of last year) was only 1.8 million. In the past seven years (2011-2005), 11,867,617 foreign (non-Saudi residents) Muslims made Hajj.
According to the below website, 56 million die every year - applying this figure uniformly to the Muslim population and simply multiplying the annual death rate by the ratio of Muslim:nonMuslim in the world, 1:5, (56 million*1/5) gives us 11.2 million deaths amongst Muslims annually. Deaths amongst Muslims far exceed the number of Muslims making Hajj.
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The facts are that vast majority of Muslims in the world will NOT perform a fundamental and obligatory pillar of their faith.
Why? The founder of Islam lived in the Arabian peninsula 1,400 years ago. During his time he envisioned Islam to only extend to the Arabs and there was no understanding of a world where with hundreds of millions and later billions of humans living thousands of miles from Mecca.
Islam was a religion for the Arabs and other people living in the region but clearly cannot handle the geographic and numerical challenges that crop up when Islam expanded beyond its intended frontier.
The Islam of today is impossible to properly follow. This isn't even an issue of individual choice - Mecca cannot handle 11-12 million foreign visitors per year. Islam's very success in growing and spreading prevents the vast majority of Muslims from fully following their religion.