The gathering of about 2,000 people in Selangor state follows allegations of Christian proselytisation in the Muslim-majority country after religious police raided a Methodist church event in August fearing Muslims were being converted.
Newspapers linked to the ruling coalition have also alleged that Christian groups are secretly trying to convert poor Muslims by using welfare such as housing, food and cash.
'Apostasy violates the wishes of Allah, there is no bigger sin,' Yusri Mohamad, the event's chief organiser, told the crowd in Shah Alam, the state capital.
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