Official sources on Wednesday said the 350 Hindus belonged to Agraura, Sonwar, Saduddinpur, Dhaniamau, Uttarpatti and Rari villages of Baksha.
The conversion ceremony took place on Tuesday at Belhara village, where Father Rajendra Chauhan read out the gospel to them.
He also gave each of the neo-convertees a locket of Jesus Christ.
Meanwhile, Angad Singh -- the husband of Belhara gram pradhan Tulsa -- alleged the poor Hindus were forcibly converted by the Christian missionaries.
He has submitted a compliant at the Baksha police station against the missionaries involved in the ''forced" conversions.
However, an FIR is yet to be registered.
Since the last four years, Christian missionaries have been active in the block, encouraging poor villagers to adopt Christianity.