The cause of Your church's destruction, is one manifestation of large-scale causes operating at a civilizational level

People are always trying to explain "the problem" of Christian churches (and indeed all types of church) in terms of some specific malign influence.

This specific problem varies (to the point of being opposite) among analysers. 

One pundit says his church's problem is infiltration by modern/ trendy pressures from "the left" (e.g. pacifism, socialism, feminism, antiracism, inclusivity)...

But another commenter says almost the opposite! That the specific problem with his Christian church is that it is reactionary, "right-wing", out-dated and has failed to adapt to modern cultural conditions. 

At this level of specific causes, opposite sides can both make a reasonable argued case; therefore it seems an endless pseudo-debate, hence futile, to persist with discourse at this specific level.

Furthermore; as well as falsely specific putative causes, analysis almost always focuses on some specific Christian church. 

This is a deeper difficulty, since every devout Christian church member (by definition) regards his own church as unique! So the fact that what afflicts his particular church also afflicts every other Christian church carries no weight with him. 

When a trend of combined mass apostasy, failure of recruitment, corruption of leaders, and non-religious emphasis in church activities is evident in his own church; the fact that the same pattern has been seen in every other denomination and over many decades is regarded as almost irrelevant by the devout church member. 

General experience is not-relevant because "they" are not "us": because all of "them" are wrong, and only "we" are right... 

But to my eye; the overwhelming fact of Christian decline is that all churches are affected in the same way, and in all Western nations, and this trend has been established and accelerating for at least seventy years.  

By seeking specific causes for particular churches, we are clearly missing the crucial point. 

My conclusion is that what is happening to destroy your church, is happening is at a very large scale, and is operating at a civilizational level - which is why no church and no religion is exempt.