[Conservatrix]

No sorry, I have attended plenty of churches that have no altar at all.
Quakers have no altar.
Mennonites have no altar.
House churches have no altar.
Charismatics have no altar.

A true Christian is not going to worship an image in stone or on a canvas, whether that image is Jesus or his mother or Kermit the Frog. A true Christian worships the Lord is spirit and in truth.
No idol worship for me!!!

[muawiyah]

Quakers (or Camisards) are not Christians (first of all), and there's the doctrine of "home as a sacred place" and "church as a sacred place", which makes the whole building the "altar".

Regarding Charismatics, there are even Roman Catholic Charismatics so you'll have to be a bit more specific. Remember, some Charismatics deviate so far from the pale of orthodoxy as to be considered something other than Christian.