Union with God still requires a distinct individual self. [definitional]
But in spite of this, in order to give this fusion any significance whatever, he must preserve some sort of self-existence, some sort of personal counter, a differentiated ego, for whom the absorption in this divine all-being is a never ending task. It is a process that neither would be possible metaphysically, nor could be felt religiously, if it did not start from the existence of the individual: to be one with God is conditioned in its very significance by being other than God.
Georg Simmel, on individuality and social…, loc. 182