"If Modi becomes the Prime Minister, India will become a dictatorial nation and only God knows who will survive that (his rule)," Abdullah, who is contesting the Lok Sabha polls from Srinagar constituency, told reporters after addressing a party workers' meeting in Budgam district.
He, however, said people have understood that Modi is a "dictator".
"The way he has sidelined senior leaders of the party, it proves that this man wants only the Modi-Modi rant and he will damage the Hindu-Muslim-Sikh Christian amity in the country.
Abdullah said there was every possibility post the Lok Sabha elections that a Third Front government backed by Congress may come to power at the Centre.
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"There is every possibility of that. There will be a government which may be a combination of the Third Front and the UPA," he said.
Abdullah said if need be, Congress should support such a formation at the Centre to keep the BJP Prime Ministerial candidate away.
"My own feeling is that time has come that Congress, as it has done before, should stand and keep Modi away. Support them (Third Front) from outside. That will be a great thing for this nation," he said.
Responding to Modi's remarks about lack of development in the state, Abdullah said, "A person who comes by helicopter and airplane, how will he see the development? Let him come and we will show him what development we have done.