Junior home minister Haribhai Chaudhary told lawmakers that extra police had been deployed to protect 240 churches in the capital, and that surveillance cameras had been installed in and around all religious centres.
Since December, five churches in the capital have reported incidents of arson or theft.
On Wednesday (local time), a church in the southern state of Karnataka was vandalised, a police official in the city of Mangalore told Reuters.
Prime Minister Narendra Modi, a declared Hindu nationalist, vowed earlier this month to protect all religious groups at an event organised by the Catholic community - a long-awaited reassurance widely seen as a response to the violence.
Days before, hundreds of Christian protesters had clashed with police on the streets of New Delhi to demand government protection following concerns that minorities were being increasingly targeted by Hindu extremist groups.
After Modi came to power last May, systematic campaigns by conservative groups to convert Muslims and Christians to Hinduism, as well as acts of vandalism and theft at churches, have outraged religious minorities.
About a fifth of India's 1.27 billion people identify themselves as belonging to faiths other than Hinduism.
Even after Modi's speech, the leader of an influential hardline Hindu organisation associated with his Bharatiya Janata Party (BJP) lashed out at Mother Teresa, the Christian nun who spent her life caring for the poor in Kolkata.
Mohan Bhagwat, the head of the Rashtriya Swayamsevak Sangh (RSS), said Mother Teresa sought "to make the person obligated so that they become Christian".
Mother Teresa, who was born in Macedonia but became an Indian citizen, was awarded the Nobel Peace Prize in 1979 for her work in the slums.
