Not like that. God the Father, Son, and Spirit are separate Entities, but all equally God. One in purpose. One in thought. One in...well everything. But not joined to a single "substance" from which they came forth.
Of course they are separate - what makes them One is that they co-equally possess the ONE Divine Substance that is God...
...God never "came forth" -God is simply Eternal as in God has always been there.
...We can't understand that with our finite minds but Sacred Scripture says it's so.
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