I did not see much Christian architecture, just an Armenian church in Dhaka.
All pictures are © Dr. Günther Eichhorn, unless otherwise noted.
From the Armenian Church, Dhaka entry in Wikipedia:
The Armenian Church (also known as Armenian Apostolic Church of the Holy Resurrection) is a historically significant architectural monument situated in the Armanitola area of old Dhaka, Bangladesh. The church bears testimony to the existence of a significant Armenian community in the region in the 17th and 18th centuries. It was built in 1781.
The church has a nice graveyard around it with old grave markers, some in Armenian script.
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Main page for বাংলাদেশ (Bangladesh)
Page last updated on Wed Mar 20 10:00:02 2019 (Mountain Standard Time)
Christian Architecture in Bangladesh on geichhorn.com