According to a recent Gallop poll, approximately one-third of professing Christians in the U.S. no longer attend church services. This includes individuals who have stopped attending altogether or attend very infrequently.

Specifically, around 16% of Christians who previously attended church no longer do so, and a significant portion of those who identify as Christian attend services a few times a year or less. 

These statistics are just the tip of the iceberg because they only include data from believers who participated in polls. The actual number of Christians who no longer attend church is likely much higher.