One of the factors that completely diminishes the message of the church is that the salvation they teach cannot be confirmed by any concrete observation. Many point to James and his "works" as confirming saving faith, but most, even preachers, are suspicious that charlatans and the religiously deluded can easily exhibit pious works without any real conversion.
When the soul's eternal destiny is supposedly dependent on having been saved, then it is essential that one be able to ascertain success by some concrete measure. Instead, what the church offers is the claim that one can only know that they are saved by being certain of the proper prescription and having thoroughly followed that prescription. In place of an observable certainty, the church offers up a "maybe but you won't know for sure until it's too late". Who can get enthused about that.
Given the stakes involved, any level of doubt is totally unacceptable. To teach that a loving God operates thus is incomprehensible.