Here's a theory about why some churches have adopted a dissolving kind of Christianity, i.e. a kind of Christianity in which everything distinct about the human person dissolves, in which there are no particular identities, no particular loves or attachments, no standards of behaviour apart from an all-encompassing and abstracted love for the other.
The theory goes like this. Christianity is incompatible with liberal modernity in its insistence on substantive, objective goods. In the Christian world view there is a standard by which some acts are inherently morally right and others wrong.
For liberal moderns this aspect of Christianity can be threatening. It can seem to be an act of power over the individual will - a violation of the sovereign individual will. Liberal moderns generally prefer a morality of non-interference. The good is to self-determine our own subjective good and not to interfere with others doing the same. Hence the morality of non-interference: of not discriminating or judging; of showing tolerance and respect; of not being bigoted or prejudiced and so on.
(Yes, it's true that liberals can be highly intolerant in enforcing a morality of tolerance and highly intrusive in enforcing a morality of non-interference but that's an issue for another day.)
So what is a Christian to do? The best option would be to reject the assumptions of liberal modernity and hold to the Christian world view. But it is the liberal world view which dominates the modern world, the world in which Christians make a life for themselves. And perhaps inevitably some Christians have tried to reconcile or form a synthesis between Christianity and liberalism.
How can the two be reconciled? If liberalism demands that no substantive goods be asserted and that we focus on not interfering with or judging the actions of others, then a possible fall back position for Christians is to focus on an abstracted, all embracing love for the other. This can be justified readily by the command to love one another and if love is all then what do moral rights or wrongs or distinct human qualities or relationships count for?
Once a church takes that path then there is nothing to hold back a philosophical merger with political liberalism. Concepts and terms are freely borrowed from a liberal political philosophy, to the point that if you read the documents produced by some modern churches you get the sense that you are dealing with a liberalism with religion added on.
There do exist hindrances, though, to the success of a merged Christianity. It requires that people are willing to give up on the idea of objective moral standards (the new standards are those derived from liberal non-interference, e.g. respect, non-discrimination, anti-sexism etc). But that means that even one kind of moral standard can derail the process. What, for instance, if some members of a church can't give up on the idea that marriage should be between a man and a woman? That upsets the basis for the merger; you then get a church set apart and perhaps a schism somewhere down the line.
Love is all was not even an adequate basis for preserving a hippy movement let alone a church. A serious church will set love within a broader understanding of human life and the human soul. It will help to foster particular loves, affections and loyalties, as well as a larger (albeit more diffuse) concern for a wider humanity.
A church which is concerned for the fate of the individual human soul must also encourage a virtuous life, which then means asserting a positive concept of morality, one which goes beyond non-interference.