The head of India's most powerful Hindu group vowed to press ahead with a campaign to convert Muslims and Christians to Hinduism, stoking a sensitive debate that has stalled parliament and threatened Prime Minister Narendra Modi's economic reform agenda.

New Delhi: The head of India's most powerful Hindu group vowed to press ahead with a campaign to convert Muslims and Christians to Hinduism, stoking a sensitive debate that has stalled parliament and threatened Prime Minister Narendra Modi's economic reform agenda.

Mohan Bhagwat of the right-wing Rashtriya Swayamsewak Sangh, which is also the ideological wing of Modi's Bharatiya Janata Party (BJP), said India was a "Hindu nation" where many Hindus had been forcibly converted to other religions.

"We will bring back those who have lost their way. They did not go on their own," Bhagwat said in a speech late on Saturday. "They were lured into leaving."

Bhagwat's comments came after BJP said it did not support forced religious conversions and called for an anti-conversion law.

India's 1.2 billion people are predominantly Hindus but there are also about 160 million Muslims and a small proportion of Christians.

Modi is under fire for being slow to rein in hardline affiliate groups that have been accused of promoting a Hindu-dominant agenda that includes luring Muslims and Christians to convert to Hinduism.

This month, a group of Muslims complained that they had been tricked into attending a conversion ceremony by Hindu groups, while a Hindu priest-turned-lawmaker of the ruling party planned a conversion ceremony on Christmas Day, although it was cancelled after the prime minister intervened.

Supporters define such events as a "homecoming", saying that families signing up for the ceremonies were originally Hindus.

"We don't want to convert anybody ... but then Hindus should also not be converted," Bhagwat said, adding that those who do not support religious conversions should bring in a law against it.

Bhagwat's comments are likely to further irk opposition parties that have disrupted parliament over the conversion issue, demanding that the prime minister himself make a statement on the issue in the upper house.

Although Modi has privately warned lawmakers in his party to back off from controversial issues such as the conversion campaign, he has so far not made any official statement on the subject, leaving it to colleagues to fend off criticism.

Meanwhile, Modi has been reported by a Marathi newspaper as having threatened to resign if the RSS - the BJP's parent organisation - does not immediately control such leaders.

According to this report in the Maharashtra Times, Modi's threat has caused 'much anxiety' among Sangh front organisations, which have now decided to act tough against anyone speaking out of turn. While Firstpost cannot confirm the authenticity of the report, a threat at this stage appears to be nothing more beyond a mere warning by the PM.

Since the last two days, there have been futile discussions between Sangh Parivar and BJP leaders. Between the different organisations within the Sangh Parivar and its leaders, there seems to be a struggle to take up controversial issues. But after Modi expressed displeasure over such issues, the Sangh has decided to act strictly against such leaders and organisations, Maharashtra Times reports.

With inputs from Reuters