The remarks by Banwari Lal Singhal, an MLA from Alwar, in a Facebook post come ahead of a bypoll to the Alwar parliamentary seat on January 29.
"Muslims were giving birth to 12-14 children....while Hindus restrict the number to one or two.
"The way the Muslim population is increasing, the existence of Hindus is in danger. It is a well-planned conspiracy to have a Muslim in the chair of president, prime minister and chief ministers," he said.
Asked about his comment, Singhal told PTI: "I wrote the post after a lot of consideration and I am not going to take it down."
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The MLA said he wrote the post after watching a video about Muslim population growth in India.
"It's a conspiracy of Muslims to capture all assembly and parliamentary constituencies by giving birth to 12-14 children and establish their rule by 2030," he alleged.
He also accused the Muslim community of exploiting government resources and "tax paid by Hindus" and batted for a law to restrict to two the number of children per family.