see the quote i posted
Again the quote you posted is showing Einstein didn't beleive in religion or a personal God. There is nothing to suggest he did not believe in a creator God - although feel free to assume what he meant. A creator God has nothing to do with mysticsm - it simply means the universe was created by an intelligent being
Where he says he is "not an atheist" is he not replying to a comment where a priest claims he is an atheist for not believing in the Christian God?
You missed the important part of that quote:
"If something is in me which can be called religious then it is the unbounded admiration for the structure of the world so far as our science can reveal it"
So his "religion" is only awe for the wonder of the universe, so we can agree he had no religion. However, he does say his feelings are NOTHING to do with mysticism...
Mystic
noun a person who seeks by contemplation and self-surrender to attain unity with the Deity and reach truths beyond human understanding.
Mystical
adjective 1 relating to mystics or mysticism. 2 having a spiritual significance that transcends human understanding. 3 inspiring a sense of spiritual mystery, awe, and fascination
Looks like he was an "I don't care" kind of person who (like many) practised the unfortunate habit of calling the wonders of the universe "God". He wasn't an atheist, pantheist, deist, or theist. Looks like he was closer to agnostic, but one that saw nothing to convince him to be otherwise.