Can't be both, that is a contradiction in terms.
Something that is one is not composed of parts, and something that is composed of parts is not one.
Deny that, and you have to throw out all of logic.
Y'all are denying the law of non-contradiction.
Discussion
you can relate infinity and nothing
but you can only relate finitude with other finitude
when you relate finitude with infinity or nothing you get infinity or nothing, they are special identities
they even can be categorised: countable and uncountable
ironcially, "real" numbers are literally uncountable
when it comes down to it, any number you can represent is finite and singular, and thus it can be related to any other finite and singular value
infinity and nothing are qualities, not numbers
it's not that God is not composed of many parts, it's that He's composed of infinite parts, so you can sit there listing them until you drop dead, and still not even touch a fraction because there is no fraction of infinity
it's not that it can't be both
you just need infinite time and energy to equate them
there is no end to the counting of the qualities and quantities of God