Do all churches face East?

I had to do a little digging for the scriptural part that references this.  In Matthew 24:27, Jesus says, "As the lightning comes from the east and shines as far as the west, so will be the coming of the Son of Man."  Ezekiel 43:4 also speaks of God’s presence as arriving from the east.  In light of these verses, as well as other verses that compare God’s encounters with Christians to the rising sun, Christians have chosen to represent Jesus second coming in architecture, art, and other types of symbolism as being "from the east to the west."
Since we're always to be watchful for Jesus' return, one of the ways the Church has called us to remember this is with the architecture of the building.  The Church chose to represent this by situating the altar, which is our focal point of worship during the Sunday liturgy, at the east end of the nave.  That way, as people worship, they're facing the direction from which Jesus is supposed to return - as if they are watching for him to arrive.  

There is a Bible verse that talks about this, Matthew 24:27 - "As the lightning comes from the east and shines as far as the west, so will be the coming of the Son of Man."   Looking eastward, we're also reminded of Jesus rising again by the rising of the sun each morning.

It also is represented in cemetery planning.  Caskets have historically been placed with the head to the west and the feet to the east to similar to how they face in the church - that way they're facing Jesus when they are resurrected at his return.  A person laying with their head to the west would face east if they were to stand up. When funerals are held in the church, it's customary during the service to place the casket with the feet toward the altar to reflect a similar image and to remind us that the deceased believer and all the company of heaven continue to worship along with the Church even in death.

One interesting exception to this custom exists, which is the funeral and burial of clergy. Clergy caskets are situated with the head facing the altar during the service and buried with their head facing east and the feet west. The reason for this is similar to above - the priest would rise to proclaim the return of Jesus to their people, which means they would be facing west to see the people.  A priest at a church I did my field work in humorously reminded me, "that means when a priest rises, he's turned his back on Jesus."
This is certainly a custom in most liturgical churches (Episcopal, Catholic, Orthodox).  Of course, it's not always practical to do so based on the land and the building.  Remember, a lot of what we do in liturgy is symbolic.  Is your service just as holy if the nave doesn't face east?  Do you worship the Lord just the same if you're facing north?  I think God is pleased any time we show our faith regardless of what direction we're facing to do it.