Re "The most dangerous prospect for this strange ecumenism is attributable to its xenophobic and Islamophobic vision": That is indeed very dangerous. But how do we compare different "dangerous prospects"?

Already since the 1980s, right-wing Catholics and Evangelicals in the US have been political allies; and even among young Catholics, there seems to be a creeping influence by Evangelicals on the more and more literalist way these young people read the Bible, for example denying that it's possible for Catholics to accept a deep-time cosmology, and a Darwinian view of the emergence of new species. If such Catholics have now made a habit of joining Evangelicals in support of pro-capitalist, pro-fossil-fuel, anti-science, anti-regulation politicians (these also being in denial re the climate crisis, and opposed to "Laudato Si'"), that amounts to a very "dangerous prospect" indeed.