It's difficult to provide an exact number of churches in Nigeria that use unleavened bread for communion. This is because:
* Diversity of denominations: Nigeria has a vast and diverse Christian population, comprising numerous denominations and independent churches. Each denomination often has its own traditions regarding communion.
* Lack of centralized data: There isn't a central database that tracks communion practices across all churches in Nigeria.
* Varying practices within denominations: Even within a single denomination, individual churches might have some flexibility in their communion practices depending on the preferences of the local pastor or congregation.
However, here's what we can say in general:
* Generally Accepted: Many Churches in Nigeria use unleavened bread.
* Catholic Church: The Catholic Church, a significant Christian presence in Nigeria, exclusively uses unleavened bread for communion.
* Other Denominations: Some Protestant denominations and other Christian traditions in Nigeria also use unleavened bread, often seeing it as more representative of the bread used during the Last Supper.
* Leavened Bread: Other denominations use leavened bread.
* Local Practices: Local availability of ingredients and cultural preferences might also influence the type of bread used in some churches.
Therefore, a sizable portion of churches in Nigeria likely use unleavened bread for communion, particularly those following Catholic traditions and some other denominations. Without a comprehensive survey, giving a precise number is impossible.