Ioannis Climacus, you are all over the place! You say that one should not kneel with Catholics as it is a posture of prayer, but the second article you link to says, "When others pray, lower your head and pray an Orthodox prayer." Isn't the bowing of the head also a posture of prayer? Someone asks about attending a funeral and you use it as a platform to spread your sectarianism.
I pray that you find the words of our divine father St. John of San Francisco instructive (I have selected certain portions and placed below. I have cited the entire thing at the bottom of this post for your reading pleasure.):
"...it is possible to meet "Orthodox" who are in fact sectarians at heart: fanatic, unloving, narrow minded, persistent in human precision, not hungering or thirsting after God’s truth, but gorged with their own presumptuous truth, strictly judging others from the summit of this their imaginary truth dogmatically correct from the outside, but lacking origin in the Spirit."
"Then as among heterodox Christians there are many who live in the truth of Orthodoxy through their spirit. There are sectarians who are aflame with the spirit and love of God and fellow man much more than some Orthodox, and that very spirit of fervent love for God and man is the mark of a true Orthodox life. Whoever among Orthodox does not possess it is not truly Orthodox, and whoever possesses it among non-Orthodox is truly Orthodox."
"The presence of such true Orthodox Christians may be observed among professed Orthodox as well as among Roman Catholics and among Protestants of all categories. It also may be observed among Russian sectarians, who have become sectarian, i.e. separated themselves in mind and experience from the dogmatic confession of the Church, partially from an inability to comprehend that confession in the Spirit, and partially from bad examples of the realization of that confession in life."
"Those who are Orthodox by their own profession and confirmation should understand that Orthodoxy is by no means a privilege, nor is it cause to judge others, nor is it pride. Orthodoxy, on the contrary, is humility. It is the confession of the fullness of the Truth, of righteousness and of love. Orthodoxy must win the victory only by its radiance, like the Lord Himself, and by no means through the use of cannon, steel or verbal (there is no difference). Orthodoxy does not shine forth in an Orthodox society that takes pride in its Orthodoxy. It shines forth in those who are humble in their Orthodoxy, who understand the purity of the faith, not only in their puny reasoning, but through the spirit through all their life."http://www.holy-trinity.org/spirituality/john.sectarianism.html