Basuki Tjahaja Purnama -- the first Christian to govern the capital in more than 50 years -- is standing trial accused of insulting the Quran, an offence that carries a five-year jail term.
The governor has apologised for his controversial remarks, which angered Muslims across Indonesia and drew hundreds of thousands to the streets of Jakarta in protests larger than any seen in nearly two decades.
Facing court for the first time, the governor gave an emotionally charged defence against the charges, pausing several times to compose himself as he maintained his innocence.
Purnama, better known by his nickname Ahok, ignited a firestorm of criticism in September when he quoted the Islamic holy text while campaigning ahead of elections for the Jakarta governorship.
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The governor accused his opponents of using a Quranic verse, which suggests Muslims should not choose non-Muslims as leaders, in order to trick people into voting against him.
Prosecutor Ali Mukartono said the governor had "spoken a lie" and insulted Muslims, adding Indonesia's top clerical council had declared his remarks blasphemous.
President Joko Widodo and police, under pressure as protesters massed in November, promised to resolve the case quickly.
Critics say the controversy is as much about politics as religion, as the governor's foes whip up anger to reduce his support ahead of a hotly contested poll in February.
Purnama is running against two Muslim candidates in elections for city hall. He had long been the favourite to win the election owing to the popularity of his no-nonsense style and determination to clean up Jakarta, a crowded, polluted metropolis of 10 million.
Purnama said he was raised a Christian but surrounded by Muslims, including family friends, who had played an enormous mentorship role in his life from when he was a child to adulthood.
The allegations that he had offended their religion hurt him very deeply. "I am very sad," he said, his voice cracking.
"This accusation is the same as saying I have offended my god parents and siblings, whom I love and they love me back."
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