Evoking the Ottoman conquest of Constantinople and vowing the Muslim call to prayer would forever ring out, President Tayyip Erdogan put religion at center stage on Saturday as campaigning for Turkey's parliamentary election entered its final week.

Persuading religious conservatives, including pious Kurds and nationalists, to back the Islamist-rooted AK Party will be key in an election Erdogan hopes will bring him stronger presidential powers that opponents see as a threat to democracy.

Turkey's most dominant politician for more than a decade and founder of the AK Party, Erdogan draws much of his support from the pious masses. His rhetoric often plays on a tension reaching back to when Mustafa Kemal Ataturk forged a secular republic from the ruins of an Ottoman theocracy in the 1920s.