In your
OP you point to real issues and problems and ask very good questions.
When I read your post I felt that what you described was essentially the root of an enormous problem that is not at all easy to visualise or express.
Essentially, you are asking how it might be possible for a people --- Europe --- to discover a guiding metaphysical idea and ideal. Yet you are also aware that Europe is in a state of falling away from any such guiding ideal. I think it is fair to say, and it is known to theorists, sociologists and philosophers, that Europe is in a fracturing state. This does not mean in every sense --- indeed the opposite might be true --- but in a *spiritual* sense.
You, like many, [seem to] feel the loss of a link to a guiding ideal and a clear metaphysic, and struggle to define what such an ideal might be or how it might be recovered.
To insure the survival of the Western ideology, in these times of religious strife and division, should the present Western political powers follow Constantine’s example and choose a State Religion?
I am not suggesting that we send out this new religion to convert by the sword the way Christianity did. I think that we are intelligent enough today to debate the morality of the various religions to determine which is the most moral and the best for nations and the individuals within them.
Is creating a State Religion the way to peace?
I would say that the problem is much larger than simple choosing to install a religion, even if that were practicable, and it is not. The issue is that we have lost the conceptual link, and also the sentimental link (a link that we feel to be real), to an Ideal that we can articulate. Once upon a time it might have been --- indeed for 1000 years in Europe it was --- an idea about *God*. But I think we would have to say that any such idea is in a state of fracturation.
I don't think that a religion, defined as what one feels one is related to at a most basic and fundamental level, is something that can be 'reasoned back into existence'. It is either there or it isn't.
Also, I am not sure that a Western ideology is a *definite thing* that can be named or revealed. Our ideas are comprised of many many different ideologies. In this sense then our present ideology is simply a fractured ideology! (I mean this in the sense of a whole mass of different ideologies non-unified).