The question can be interpreted as:
If someone lets you into their house, can they throw you out? And if they throw you out, can they let you back in again?
On a few 'meta' / process points about discussing this subject:
1. They usually take a lot of time, and sometimes more than fits everyday needs or interests. Some people, nations, organizations also have heavy financial, occupational, etc interests in the subject - it is not industrially or national interest value-free. This limits the possibilities of a bias-free discussion in a public forum without causing side effect financial losses where none is wanted nor intended.
2. There are fixed genetic and nervous system (various biological - eg. psychoneuroendocrinological) biasses in addition to cultural and situational and phase-based ones (eg. where in the grief cycle someone is, or if they are at all) that determine how each of us reacts to anything. In practice, this means that any 'model' that is useful enough for understanding a human behaviour (including matters of religion, or in fact any belief) soon gets quite complex to the point of absurd difficulty. Plus the usual fallacies, role and status defences, cognitive style 'fencing' intrude, disputes about the relative merit or level of significance, as well as good wit, facts, and accommodation of the other's view. Our difficulties in communication about the subject are far from merely personal.
The traditional open question (for almost any still-contentious thing) - is: can this particular matter be finally simply resolved without ruffling anyone's feathers, and justify the view they significantly advanced in the first place?
In the main just so we can put those folk (and ideas) which overstep the actual facts mark (ie. waste our valuable time) firmly back within their rational, still useful, but more- limited range.
For the question we have somewhat segued around to of:
is there any value in religious (ie. organized group) belief, for anyone, at any time, or has there ever been?
I suspect we all know some of the more obvious facts which support a yes to-some-aspects of it answer. To be blunt (and somewhat banal), johnny got a job out of it, academic x1 - 300 got jobs out of it, economy y makes xx billion a year, it did help mario persist in a difficult situation and hold onto his grades and wits...etc - on a purely everyday level. Adaptive gain for some is, obvious.These gains are far from banal - the banality only arises in giving them short-form descriptive treatment for want of time.
Service delivery failures are, we know, historically notorious and beyond dispute.
In the current research clime of understanding human behaviour, one technical question (for theist theorists, I suspect) is:
can religion (per se as a construct) withstand the assaults of increasing scientific knowledge of delusions, hallucinations, etc etc with its head held high?