So, what is the point of a church altar?
In Roman Catholic liturgy specifically, the altar is where the Eucharistic Sacrifice is made; i.e., Christ's one sacrifice on Calvary is made present again on the altar at each mass. The altar, in this theology, is still for performing sacrifices.
As the largest unified body of Christians on the planet, Roman Catholics have a large influence on the terminology we use. Note that as a Protestant I don't agree with this theology, but the term "altar" likely persists in our churches merely as a matter of "stale" terminology used by those who do not know better. Protestant theology (at least all that I'm aware of) does not allow for an "altar." The reason to have an altar is antithetical to the Protestant doctrines regarding regeneration and justification and having something that fulfills the purpose of altar (meaning that it isn't just a matter of stale terminology) is nonsense in Protestant churches.
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In Eastern Orthodoxy, the Altar is the type of the Altar in Heaven as described in Revelation. In the Anaphora, the Church joins in the 'One Liturgy' going on in heaven, and the Christ who offers himself once and for all becomes present in the gifts on the altar as a bloodless, spiritual sacrifice.
As a secondary note, it is traditional for the relics of Martyrs to be embedded in the bottom of the altar, following Revelation.
In the church in which I grew up (a United Methodist church), we have a wooden altar in the middle of the front of the sanctuary. It serves a purpose in two main contexts in the service:
In light of these two things, Here are my thoughts on the altar, with the caveat that none of this is confirmed as doctrine:
The altar is an ancient religious symbol of sacrifice. I agree that the Jewish laws of sacrifice are not demanded of Christians, and in light of that alone it seems strange to have an altar any more. However, as Narnain mentions, the altar is very different now than it was then. So if it's not a Jewish sacrificial altar, what is a Christian altar?
My answer is that it's still a symbol of sacrifice, but a whole different kind - it's a symbol of Christ's sacrifice. It's an altar that has had its order filled, and we keep it as a reminder of that sacrifice. Likewise, whether they are mandated in the same way or not, Christians still make sacrifices and offerings to God, and I find it very fitting to make such a sacrifice on an altar that is symbolic of Christ's sacrifice for me.
I don't believe there is a scriptural demand for churches to contain altars, and neither do I believe that there is scripture which explicitly disallows altars. I feel like they are much more symbolic than anything, but I think there's plenty of grounds for justifying one.