Fr Dominic Pinto was arrested on charges of trying to convert poor Hindus.
Seventeen Christians, including pastors, have been jailed this year already.
At least two cases per day this year, says the UCF Christian group
In January, 11 Indian states have enacted anti-conversion laws, with two enacting them this year.
The Legislative Assembly passed the bill last December.
Four years ago, the young man converted to Christianity and has been arrested and detained multiple times since then.
A Karnataka church was attacked and vandalised while the Legislative Assembly was debating the bill.
Radical nationalists falsely accuse Christians of forcefully converting individuals to Christianity to justify harassment.
In nine states, anti-conversion laws have been enacted to provide a legal umbrella to radicals to persecute Christians.