Buddhism and Hinduism.

According to Wikipedia, Bangladesh- Islam (89.6%), Hinduism (9.6%)

Bhutan- Buddhism (76%). Hinduism (23%)

India- Hinduism (80.5%), Islam (13.4%), Christian (2.3%)

Maldives- Islam (According to the revised constitution, article nine says that "a non-Muslim may not become a citizen of the Maldives")

Nepal- Hinduism (80.6%), Buddhism(10.7%)

Pakistan- Islam (97%)

Sri Lanka- Buddhism (70%), Hinduism (15%)

Hinduism is most prevalent in India, Nepal, Sri Lanka, Bhutan, Myanmar.

The main religions in Bhutan are Lamaistic Buddhist (75%) and Indian- and Nepalese-influenced Hinduism (25%).

The official state of the religion is Drukpa Kagyupa.

Depending on the source, 1% are classed as following other religions.

in Bhutan