Adherence to the Five Pillars of Islam are the foundation of Muslim faith. Which one was the first and most impportant one upon which all others are based?
a. Dedication to daily prayers facing Mecca
b. Acknowledgment of Allah as the only deity and Muhammad as his prophet
c. The Ramadan fast, with exceptions made for the young and infirm
d. Almsgiving to the poor by all who have the means to afford it