"The process of using Islam for leadership legitimation purposes gathered momentum during the military regimes of General Ziaur Rahman (1975-1981) and General H.M. Ershad (1982-1990). Zia doctored the Constitution, "scraped secularism from the four state principles [and inserted] Bismillahir Rahmanir Rahim (in the name of Allah, the beneficent, the merciful)". The principle of secularism was overturned and replaced by the words, 'Absolute trust and faith in the Almighty Allah shall be the basis of all action' "."
January 1, 1970
https://en.wikiquote.org/wiki/Constitution_of_Bangladesh