Fine. If you choose to fellowship with other Christians and worship with them, then you would be prepared to accept their rules, yes? Definition of hypocrisy noun from the Oxford Advanced Learner’s Dictionary:
*hypocrisy noun
BrE /hɪˈpɒkrəsi/ ; NAmE /hɪˈpɑːkrəsi/ (pl. hypocrisies)uncountable, countable
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behaviour in which somebody pretends to have moral standards or opinions that they do not actually have *
oxfordlearnersdictionaries.com/us/definition/english/hypocrisy. If you were to take Communion in a Greek Orthodox Church, it would be widely understood that you accepted Greek Orthodox doctrine. We should focus and work toward real unity, as Jesus prayed and we should welcome all who would worship with us, as is appropriate for Christians to do. We should also accept the fact that there are boundaries.
I find it ironic that there are those who vehemently disagree with Catholic doctrine and yet
utterly insist that it’s their right to commune with them. Why take Communion with a part of the Christian family one believes is in error? Is it herd instinct? Everybody
else is doing it, so why not you? Most people who pray in Catholic or Russian Orthodox Churches are Catholics and Russian Orthodox ( generally in good standing) themselves. They know what their Church expects of them and they assent and abide by those expectations. We
should be united and in the Kingdom of Heaven we* will* be united in Christ in a Communion that will doubtlessly make what we experience now look like a faint shadow. Until then, we pray and follow the rules. My mother’s a Baptist and I’m an LCMS Lutheran. Per the rules of my own Synod, I don’t partake in her church’s Communion services and unhappily, she can’t participate in mine unless she affirms the RP, which she isn’t prepared to do at this time. Until then, we will visit and pray at one another’s services ( Mom likes our Advent and Christmas services. You really can’t beat a Lutheran Divine Service at Christmastime), while accepting each other’s differences.