Bears repeating and a big bump!
It's not about him; it's about Him. The Catholic Church is like a big umbrella - there's plenty of room for different expressions of the same faith. There is no place for heterodoxy.
You say, "Pope Benedict is pursuing ecumenism," and that Pope Benedict "thinks [ecumenism is] the right thing to do and what our Lord wants."
We say say, to you and to Pope Benedict XVI, "To those who attack the Church of Christ by teaching that Christ's Church is divided into so-called 'branches' which differ in doctrine and way of life, or that the Church does not exist visibly, but will be formed in the future when all 'branches' or sects or denominations, and even religions will be united into one body; and who do not distinguish the priesthood and mysteries of the Church from those of the heretics, but say that the baptism and eucharist of heretics is effectual for salvation; therefore, to those who knowingly have communion with these aforementioned heretics or who advocate, disseminate, or defend their new heresy of Ecumenism under the pretext of brotherly love or the supposed unification of separated Christians, Anathema!"
(The Synod of Bishops of the Russian Orthodox Church Outside of Russia, 1983)
Because of its great importance to the Catholic Church, the above anathema is included in the Synodicon of Orthodoxy. And the person who saw to this anathema being promulgated in the first place has been glorified as a saint of the Church, St. Philaret of New York City, the New Confessor.
It's official. Your Pope is a heretic, as are also all who follow him.
That's final and there is no room for discussion.