Since God is infinite, how could an infinite multiverse be explained, if, indeed it exists? Doesn’t that go against our faith?
I don’t think so. It’s important to use the word ‘infinite’ in a way that doesn’t lump all ‘infinite’ things together as if they were equivalent. If I pointed to a number line, and asked you to count all the natural numbers between 1 and 10, you’d say “10”. But, if I asked you to count all the natural numbers, you’d tell me that they were uncountable – i.e., there is an infinite number of them. Then, suppose that I ask you to go back to the segment between 1 and 10, and count all the real numbers there. Again, you’d tell me ‘uncountable’. Now, real numbers and natural numbers are both ‘uncountable’, but real numbers are ‘more’ uncountable, as it were – that is, natural numbers get bigger ‘faster’ than real numbers – there are more real numbers in any finite segment of the number line than there are natural numbers. So, if we were comparing cardinality (that is, the number of members of a set), we’d say that real numbers are a set with greater cardinality than the set of natural numbers, but that both are uncountable.
How does that help your question, though? Well, the issue is based on the question of how to compare the notion of ‘infinity’ in the universe and as applied to God. With the universe, we might suggest infinity in its
extent – that is, it goes on as far as we can see, and it seems that, if it’s expanding, it will be without limit. So, if we tried to count the number of miles of breadth or width or height of the universe, we might say that it’s uncountable. But, when we say that God is ‘infinite’, do we mean that He is
big? No, that doesn’t make sense – after all, God is spirit, so he doesn’t have physical extension. So, we can’t say anything about the ‘size’ of God, let alone attempt to compare God’s ‘size’ to the size of anything physical.
But, what if we tried to count the number of ‘things’ in the universe – galaxies, stars, planets, even atoms – would we say that these are uncountable and try to compare them to the number of parts of God? Again, no: God is simple, not compound, so there are not ‘parts’ to God. If we tried to ‘count’ God, we’d say that He is ‘1’. So, we can’t mean a comparison that deals in the cardinality of God.
In other words, when we speak of God being infinite, we mean something different than when mathematicians or physicists talk about infinity; when they talk about it, they’re counting things (members of a set, physical size, etc), but when theologians talk about God, they’re
not attempting to count anything physical about Him.
Therefore, in response to your question: no. When physicists posit infinite
anything, it doesn’t conflict with God or challenge His majesty. It’s not absurd to posit an infinite God who creates infinities in the physical realm; and the mere presence of an infinity in creation doesn’t mean that the creation is greater than the creator!