It's laughably uninformed to say that Einstein only used the word god only as metaphor. The continued tactic of conflating religion with god is a sign of a lost argument.
Once again, Einstein
in his own words: I cannot conceive of a personal God who would directly influence the actions of individuals..'' My religiosity consists of a humble admiration of the infinitely superior spirit that reveals itself in the little that we can comprehend of the knowable world. That deeply emotional conviction of the presence of a superior reasoning power which is revealed in the incomprehensible universe, forms my idea of God.
and
I believe in Spinoza's God, Who reveals Himself in the lawful harmony of the world, not in a God who concerns himself with the fate and doings of mankind.
There are many, many more direct quotes where he uses the term "God" not as metaphor but as reference to something transcendental.
Again, he specifically said that while he did not believe in a personal god and found the teachings of Judaism/Christianity/Islam "childlike" he specifically favored that view over the athiest view saying:
"such a belief seems to me preferable to the lack of any transcendental outlook."
It's unfortunate that some chose, either due to lack of education regarding the broad meaning of the word "God" or due to their own agenda, conflate god with religion and presuming that all religions and non-religious people conceptualize god in the same way the followers of Judaism/Christianity/Islam do.
And you'd be very hard pressed to find a genuine atheist who uses Einstein as some appeal to authority like the religious people are so desperate to do.
I would think not since Einstein specifically opposed the athiest ideology! If religious people do, that's not justified either since he specifically was opposed to the religions he was familiar with (Judaism/Christianity/Islam).
Personally, my interest is not in any specific ideology and trying to argue that one is the "right" one is foolish. I am interested in the topic of religious and non-religious thinking as it pertains to both the physical and the transcendental. I find Einstein's views in this area incredibly interesting and hate to see them misrepresented.
He wrote extensively on this topic and if someone is truly interested I highly recommend
Einstein and Religion: physics and theology. which is published by Princeton University press where he worked and where his papers are archived.
If you have an argument with Einstein's views just say so. Insisting that when he says "I believe in Spinoza's God" he was using the term as metaphor is not factually correct.