[Destro]

How can the perfect church have imperfect doctrine?

The Church is imperfect because it is made up of imperfect men. The doctrine is perfect but men are not - not even the Pope.

Infallibility on doctrine is only given to an ecumenical council alone. They ecoumenical councils remove errors and define devine truth as they have done 8 times since Pentacost.

[Conservative til I die]

But the doctrine is not perfect. It either was perfect and is not imperfect, or was imperfect and now perfect. Or was imperfect and still imperfect, though less so.

I pulled some quotes from a reputable site showing the evolution in doctroine:

In the first edition, first printing (1963) of The Orthodox Church by Timothy (Kallistos) Ware - a widely-cited and authoritative source on Orthodox teaching -, the author states (page 302):

Artificial methods of birth control are forbidden in the Orthodox Church.

The first edition, revised 1984 version of The Orthodox Church, however (NY: Penguin Books, page 302), states (emphasis added):

The use of contraceptives and other devices for birth control is on the whole strongly discouraged in the Orthodox Church. Some bishops and theologians altogether condemn the employment of such methods. Others, however, have recently begun to adopt a less strict position, and urge that the question is best left to the discretion of each individual couple, in consultation with the spiritual father.

The second edition, revised 1993 version of The Orthodox Church reveals even further alarming departure from Orthodox and previously universal Christian Tradition (page 296; emphasis added):

Concerning contraceptives and other forms of birth control, differing opinions exist within the Orthodox Church. In the past birth control was in general strongly condemned, but today a less strict view is coming to prevail, not only in the west but in traditional Orthodox countries. Many Orthodox theologians and spiritual fathers consider that the responsible use of contraception within marriage is not in itself sinful. In their view, the question of how many children a couple should have, and at what intervals, is best decided by the partners themselves, according to the guidance of their own consciences.

Or note another statement from a revered Orthodox Patriarch, in 1968:

We assure you that we remain close to you, above all in these recent days when you have taken the good step of publishing the encyclical Humanae Vitae. We are in total agreement with you, and wish you all God's help to continue your mission in the world.

{Telegram from Patriarch Athenagoras to Pope Paul VI, 9 August 1968, reprinted in Towards the Healing of Schism, ed. & trans. E.J. Stormon (1987), p. 197}