This is a good article against ecumenism: https://pravoslavie.ru/80888.html
And here is a recent example of the mind behind ecumenism, thinking that The Church must set aside our exclusivity and truth in order to proclaim a new gospel. They claim it's ancient, but it's really a step towards new world religion and eerily similar to Protestants in America having come together to celebrate "light" and "truth" and "The Great Architect" within free masonry, setting aside their hard to defend differences to reach a higher, unifying, "esoteric" truth. Rather than simply coming to The Church which has been preserved inviolate for 2,000 years, even after great divisions. I think that Met Alfayev Hilarion clarified "uniting as much as possible" because he knows there are limits that he will not cross and he has a different goal, but the Anglican Church is ok with unity lacking union in truth. To say that we need only to focus on "holy remnants" outside of the context of The Church and for those "holy remnants" to care only about basics of faith as if it's impossible or unnecessary to know the fulness of truth but yet possible to avoid secularism, is to say that there is no purpose in One, Holy, Catholic, and Apostolic Church which is the pillar and ground of truth 1 Timothy 3:15, the one faith once delivered to the saints Jude 1:3.
And here is a recent example of the mind behind ecumenism, thinking that The Church must set aside our exclusivity and truth in order to proclaim a new gospel. They claim it's ancient, but it's really a step towards new world religion and eerily similar to Protestants in America having come together to celebrate "light" and "truth" and "The Great Architect" within free masonry, setting aside their hard to defend differences to reach a higher, unifying, "esoteric" truth. Rather than simply coming to The Church which has been preserved inviolate for 2,000 years, even after great divisions. I think that Met Alfayev Hilarion clarified "uniting as much as possible" because he knows there are limits that he will not cross and he has a different goal, but the Anglican Church is ok with unity lacking union in truth. To say that we need only to focus on "holy remnants" outside of the context of The Church and for those "holy remnants" to care only about basics of faith as if it's impossible or unnecessary to know the fulness of truth but yet possible to avoid secularism, is to say that there is no purpose in One, Holy, Catholic, and Apostolic Church which is the pillar and ground of truth 1 Timothy 3:15, the one faith once delivered to the saints Jude 1:3.