In a sense yes, but remember that communist philosophy is rooted in Western philosophy which presupposes a Christian personal god and forms of faith or belief.
In other systems of thought, god and belief don't mean the same exact things. For example in Indian religions, god may mean a personal god, sometimes many, and faith or belief is approximately the same. But god can also mean the universe itself as an infinite spacetime, a fuller reality behind material reality, maybe even no god at all. Likewise belief is ranked as only one form, and a lower form, of knowledge with rational forms ranking higher.
On a practical note, the abolition of religion and its dregs does not always apply across the world as a solution for the proletariat. Which is why you may see communists who are eg. Hindu, Buddhist, Muslim, etc. outside the Western world.