2 Thessalonians_2:3 Let no man deceive you by any means: for that day shall not come, except there come a falling away first, and that man of sin be revealed, the son of perdition;
The remedy for this is discipleship. When we are busy about the work of discipleship, we will be very conscious of and sensitive to sin in the lives of the people whom we are investing time in. We will naturally be accountable to one another and we will have the relationships necessary to confront sin in each other's lives. Apostasy is the result of not loving and caring for each other enough to be involved in each others lives.