In general, my impression is that Christian churches are declining in the West - declining in numbers and in quality.
Obviously this applies to the 'mainstream', liberalised denominations such as Anglicans, Methodists and Roman Catholics; which are not just declining but collapsing. However, this decline has even begun to affect new Christian churches that have until fairly recently been growing in The West, such as Mormons and Jehovah's Witnesses.
Seventh Day Adventism is apparently growing in the UK, but almost entirely among recently arrived immigrants.
A few churches apparently thrive - mostly those of a conservative evangelical type and Pentecostals. But I think this apparent growth is deceptive, because:
1. Growth is substantially of recent immigrants (especially, Chinese mostly-converts and Africans who are already Christian), and
2. Growth is substantially of already-Christians (e.g. mainstream Anglicans, Methodists and Catholics) who have transferred into more traditionalist from the apostate and anti-Christian toxic atmosphere of the liberalised denominations; mostly in response to the permeating, corrupting and collapse-inducing effect of leftist 'social justice' politics - especially the sexual revolution.
(For example, every single Christian denomination that has institutionally instituted female priests or pastors has rapidly and irreversibly begun to collapse.)
In sum, a critical and honest analysis of UK data would - I believe - reveal across-the-board decline in all Christian churches without exception.
In the US there is a small exception, which is the growth by natural increase - high fertility and retention - of 'enclosed' groups like Amish and Hutterites.
So, the picture in The West, among Western populations, is abandonment of Christian churches; with no counter examples except among those churches who substantially reject modernity and cut themselves off from The World.
What are the implications? Well, one is that none of the types of Christian conservatism or traditionalism are viable. They are certainly less rapidly-suicidal than the liberalised churches; but they are not truly thriving among the western populations.
Nobody - not one single church - can any longer regard themselves as a successful 'model' for Christianity in the 21 century in The West and for Westerners.
This is important, because most of the less-obviously-failing churches are trying to restore an earlier type of Christianity: the Roman Catholics hope to re-set their church and its liturgy to how it was before Vatican II, Anglicans hope that Bible-based evangelicalism will hold the line on morality and grow their churches; 'confessional' Protestants hark back to the earlier eras of Calvinism, Lutheranism, Methodism...
In general these serious Christians are doubling-down on traditionalism in response to liberalism and apostasy - however, the best that can be said for this as a strategy is that it is less of a failure than liberalisation... It is not actually succeeding.
What to do instead? Well, when no known, no tried-and-tested, option has any track-record of succeeding - then I presume what we ought to do is... whatever we ought to do.
And I mean whatever we, individually, ought to do - because the institutional church is demonstrably failing: all-round and everywhere.
Either we need new kinds of institutions, or new kinds of individual Christianity.
It may be that this is the major task for Western peoples here-and-now - learning how to become and how to remain real Christians; as the churches - and I mean All the churches - collapse around us.