The church held a three-day revival that helped many people renew their faith.

revival 是由动词 revive（使复苏、复兴）加上名词后缀 -al 构成的名词，表示"复兴、复苏"的活动或状态。在宗教语境中特指"信仰复兴会"，即通过集会活动帮助信徒重新坚定信仰。