If he does, they say he will become an apostate from Islam, since Islam forbids Muslims to give good wishes to Christians on the occasion of their feasts. And if he is an apostate from Islam, then according to Muhammad’s command and Islamic law, he can lawfully be killed.
“FPI Calls on President Not to Wish Merry Christmas,” Tempo.co, December 19, 2014 (thanks to Phillip):
TEMPO.CO, Jakarta – Micbachul Anama, the chairman of the Islamic Defenders Front’s (FPI) consultative council, has asked President Joko Widodo not to wish the country’s Christians a merry Christmas. Micbachul said the president would be deemed an apostate should he opt to do so.
“It is haram (forbidden for Muslims) to wish a merry Christmas, including for President Jokowi,” he told Tempo on Thursday, December 18, 2014.
Micbach claimed wishing a merry Christmas to Christians would make a Muslim an apostate for acknowledging the existence of another religion. He explained, according to the Great Dictionary of Indonesian Language (KBBI), Christmas is defined as the birth of Jesus Christ.
“So when there’s a Muslim who says a marry Christmas, it means he congratulates (Christians) on the birth of Jesus,” he said.
In that context, he went on, wishing a merry Christmas to Christians had a serious impact on the faith of Muslims. “Whereas it is stated clearly in Islam that God is lam yalid wa lam yulad. God was not born and does not give birth to,” he said.
The country’s largest Islamic organization, Nahdlatul Ulama (NU), meanwhile, said in contrast that wishing Christians a merry Christmas was an act of tolerance and would not affect one’s principles and religious identities….