Five Pillars of Islam

The Shahadah, which means "testimony", is the name of the Islamic profession of faith. It is the most important of all Five Pillars, and its recitation in Arabic is required for a person to become a Muslim.^[2] It reads, "There is no god but Allah and Muhammad is the messenger of Allah." Shi'ite Muslims may add "and Ali is the friend of Allah," but this is not obligatory.^[3]

Salah is the practice of formal prayer in Islam. It is a ritual prayer, having prescribed conditions, procedures, and times. It consists of five daily prayers: Fajr (dawn), Zuhr (noon), Asr (afternoon), Maghrib (evening), and Isha'a (night). Muslims must wash before prayer; this washing is called wudu ("purification").

Even though it's called "a pillar of Islam", early Muslims didn't practice it. Muhammad started his religion in 610 and prayer became obligatory after Isra and Mi'raj^[4] around the year 621.

Sawm is the term which refers to Islamic fasting. The observance of sawm during the Islamic month of Ramadan is compulsory.^[5] Adherents usually wake up before dawn and eat and drink to prepare for the fast. During the fast, they refrain from eating, drinking, smoking, and engaging in sexual intercourse from dawn (fajr) to sunset (maghrib).

If fasting is a necessary pillar of Islam, then it means that the whole Meccan period and two years of Medinan period wasn't Islam:

Zakat is an obligatory tax^[6] required of Muslims, amounting to about 2.5% of one's wealth over the course of a year. Under the caliphates, the collection and expenditure of zakat was a function of the state (this still remains the case in countries such as Saudi Arabia).^[6] Slaves and horses owned by Muslims are exempt from this taxation,^[7][8] and it is generally agreed that non-Muslims are not to benefit from the alms giving.^[9]

The Hajj is a pilgrimage to the city of Mecca which every able-bodied Muslim is obliged to make at least once in their life.^[10] The pilgrimage takes place on the 12^th month of the Islamic calendar (Dhu al-Hijjah). The main rituals include walking seven times around the Ka'aba, touching the Black Stone, traveling seven times between Mount Safa and Mount Marwah, and symbolically stoning the Devil in Mina.^[11]

Jihad is sometimes referred to as the sixth pillar of Islam,^[12] as it is also a compulsory duty, and Prophet Muhammad referred to it as "better than standing in prayer for sixty years"^[13] and second in importance only to the belief in Allah and himself.^[14] According to some Shi'ite sects it is the seventh not sixth pillar.^[15]

• Qur'an Only Islam - Why it is Not Possible