The most important paragraph in Mr. Tammeus piece is the one noting the indifference and ecumenical and theological illiteracy in the pews of all our churches. Add in a layer of misinformation about the dogmas and history of churches not our own, and it is unsurprising ecumenism gets short shrift.

Then add two troubling factors. The continuing hostility toward your church of a wide swath of Ecumenical church-goers and leaders. From your end, a near requirement (like a secret pledge) for traditionalist RC to turn their faces, and comments, often venomously, against ecumenism in any form. That the last four Popes, have all appeared in mainline Protestant churches for ecumenical services, and the facade of St. Peter's hasn't fallen, seems to go unnoticed.  But the good news is we are doing better. Familiarize yourself with ARCIC and also the Lutheran statement on grace and salvation. Reflect that in a week the Sistine choir will sing Anglican evensong. In an Episcopal church, no less.