That is simply NOT true.
These differences are so important that there has been no reconciliation in nearly a thousand years after the split. The Eastern Orthodox differ with Roman Catholicism on these issues:
The Holy Spirit (the filioque)
In EO - The third person of the Trinity, proceeding from the Father alone as in the original Nicene Creed. The Father sends the Spirit at the intercession of the Son. The Son is therefore an agent only in the procession of the Spirit.
In RC - 'When the Holy Spirit proceeds from the Father and the Son, He is not separated from the Father, He is not separated from the Son'.
Mary - Assumption and Immaculate conception of
EO - The Assumption is accepted and it is agreed that Mary experienced physical death, but the Immaculate conception is rejected. Orthodox belief is that the guilt of original sin is not transmitted from one generation to the next, thus obviating the need for Mary to be sinless.
RC - Both are dogmas of the church. The church has not as yet decided whether Mary actually experienced Physical death. The dogma of the Immaculate Conception states that Mary, was at conception 'preserved immaculate from all stain of original sin' and should not be confused with the virgin birth.
Pope - Authority of
EO - As the Bishop of Rome, he has a primacy of honour when Orthodox, not of jurisdiction. At present, his primacy is not effective as the papacy needs to be reformed in accordance with Orthodoxy. His authority is thus no greater or lesser than any of his fellow Bishops in the church.
RC - The Pope is the 'Vicar of Christ' i.e. the visible head of the church on earth and spiritual successor of St. Peter. He has supreme authority (including that over church councils) within Christendom (The Power of the keys).
Pope - Infallibility of
EO - Papal Infallibility is rejected. The Holy Spirit acts to guide the church into truth through (for example) ecumenical councils. This Orthodoxy recognises the first seven ecumenical councils (325-787) as being infallible.
RC - The Pope is infallible when, through the Holy Spirit, he defines a doctrine on faith and morals that is to be held by the whole church. This is a dogma and is therefore a required belief within Catholicism.
Purgatory
EO - An intermediate state between earth and heaven is recognised, but cleansing and purification occur in this life, not the next.
RC - A place of cleansing and preparation for heaven. Also a place where the punishment due to unremitted venial sins may be expiated.
I'd say these were the "biggies", but other differences also exist. These are explained here.
http://christianityinview.com/comparison.html
And Catholics obey Christ's teachings?
Like this one?
Matthew 23:1-12 Then Jesus said to the crowds and to his disciples, “The scribes and the Pharisees sit on Moses' seat, so do and observe whatever they tell you, but not the works they do. For they preach, but do not practice.
They tie up heavy burdens, hard to bear, and lay them on people's shoulders, but they themselves are not willing to move them with their finger. They do all their deeds to be seen by others. For they make their phylacteries broad and their fringes long, and they love the place of honor at feasts and the best seats in the synagogues and greetings in the marketplaces and being called rabbi by others.
But you are not to be called rabbi, for you have one teacher, and you are all brothers. And call no man your father on earth, for you have one Father, who is in heaven. Neither be called instructors, for you have one instructor, the Christ. The greatest among you shall be your servant. Whoever exalts himself will be humbled, and whoever humbles himself will be exalted.
Call no man *father*. And you assign the title of what to your priests again?
That is proven by the fact, apparently unfamiliar to you, that churches wholly Orthodox in character are already in union with the Catholic Church: they are Byzantine, Melkite, Ukrainian Catholic, and several others.