After passage of a gay marriage bill in New York, Timothy Dolan, the Roman Catholic archbishop of New York, warned against polygamous unions.

Last month, the New York Senate approved Governor Andrew Cuomo's plan to make New York the sixth – and most populous – state to legalize gay marriage. Cuomo quickly signed the bill into law and gay and lesbian couples will be able to wed in the Empire State starting on July 24.

Dolan had strongly condemned allowing gay couples to marry, calling it an “ominous threat” to society and “a violation of what we consider the natural law that's embedded in every man and woman.”

Writing at his blog, Dolan warned that the push for government recognition of polygamous unions had already started.

“And now we ring the steeple bell again at this latest dilution of the authentic understanding of marriage, worried that the next step will be another redefinition to justify multiple partners and infidelity,” Dolan wrote. “If you think I'm exaggerating within days of the passage of this bill, one major newspaper ran a flattering profile of a proponent of what was called 'nonmonogamy.' Apparently, 'nonmonogamy' is the idea that society is unrealistic to think that one man and one woman should remain faithful in marriage, and that openness to some infidelity should be the norm!”

Dolan also apologized if he offended anyone in the gay community.

However, the bishop began his post with the suggested that gay marriage backers were after his head for speaking out against the institution.

The bill was approved “hauntingly, on the Feast of the Birth of John the Baptist, whom King Herod would behead because the saint dared to defend the God-given truth about marriage.”