The BJP, however, stood behind the Yogi, notwithstanding his strident pro-Hindutva credentials, insisting "he stands for development".
"It is a big assault on secularism in the country. Maybe, the BJP or RSS would like to endorse their cause of Hinduism. India is not Hinduism. Hinduism is not India.
"India is built above castes and religions and 'Vasudhaiva Kutumbakam' (the world is one family) is the very foundation of our secular society. It is the biggest assault ever done on secularism," Moily said.
Maintaining that the prerogative of choosing a Chief Minister rested with the ruling party, Surjewala said, "Excessive delay in arriving at a decision as also the compulsion to create two posts of Deputy CMs reflects a bitter conflict to share spoils of power despite overwhelming majority of over 300 MLA's."
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Notwithstanding the Hindutva rabble rouser image of the 44-year-old 5-time MP from Gorakhpur, BJP spokesman Siddharth Nath Singh said, "That image may be with media but he has been elected again and again. He stands for development and that is the agenda we have got and we will will stick to the agenda."
"New dimensions of development will be established in the state under him," party general secretary Bhupendra Yadav said.
Madhya Pradesh Chief Minister Shivraj Singh Chouhan said UP will benefit a lot from his "competent leadership" and will soon become 'Uttam Pradesh'.
"Every citizen of the state will benefit from Adityanath's philosophy of people's welfare and taking everybody along. Development of all will be done," Chouhan tweeted.
Mukhtar Abbas Naqvi, the lone Muslim minister in the Narendra Modi government, defended BJP's choice of Adityanath as the next UP chief minister, saying he will work for the party's "inclusive growth" agenda.
Rejecting suggestions that he was a Hindu hardliner, Naqvi said Adityanath was a "hardline leader of inclusive development" who will prove political pundits and analysts who have apprehensions about him "wrong".
Samajwadi Party MP Naresh Agrawal reacted cautiously to the Yogi's elevation.
"I congratulate him on his election. We will wait and watch for six months. We hope he will change his thinking and desist from creating a divide between Hindus and Muslims. If he does, we will go among the people and oppose him," he said.
"It is clearly the RSS agenda and UP is the new experimental field for it. Since it is the victory of RSS (in UP elections), it has chosen the CM.
"This gentleman has a criminal record. Several charges like rioting and more serious offences are against him in various courts in UP. That's the issue. Then why this rhetoric of ending criminalisation," she said, apparently referring to the BJP's criticism of the erstwhile Samajwadi Party government over alleged poor law and order.