Religion in Bangladesh

Bangladesh is a secular country. Although removed from the constitution once, it was later reinstated, but the constitution recognises Islam as the state religion of Bangladesh. Islam is the largest religion of Bangladesh; Muslims constitute over 86.6% of the population, while Hindus and Buddhists are the most significant minorities of the country. Christians, Sikhs, animists and atheists form the minuscule remainders. A survey in late 2003 confirmed that religion is the first choice by a citizen for self-identification. Bangladesh only recognises Islam, Christianity, Hinduism, and Buddhism.

Muslims constitute over 87% percent of the population. Muslims are the predominant community of the country and they form the majority of the population in all eight divisions of Bangladesh. Overwhelming majority of Muslims in Bangladesh are Bengali Muslims, but a small segment of them are Biharis and Rohingyas. Most Muslims in Bangladesh are Sunnis, but there is a small Shia community and an even smaller Ahmadiyya community. Most of those who are Shia reside in urban areas. Although these Shias are few in number, Shia observance commemorating the martyrdom of Muhammad's grandson, Husain ibn Ali, is widely observed by the nation's Sunnis. Muslims celebrate Eid ul-Fitr, Eid ul-Adha, Muharram, Milad un Nabi, Shab-e-Barat and Chand Raat all across the country with much fanfare and grandeur. The annual Bishwa Ijtema is the largest and most notable congregation of Muslims in Bangladesh.

...
Wikipedia