I am technically a Christian (leaning agnostic) and for my part am quite certain NOTHING which EXISTS is definable in way using infinity as a quantitative value.
At the risk of driving the conversation (answer I mean) into a no-man's land of tangential reference, it may of value to present an argument capable of rendering such questions impotent via means one might consider a bit unorthodox. The intent here is to impart a (hopefully) useful methodology for such issues, for both question submitter and reader.
Briefly...referencing my views on the 'infinity' matters in the first sentence of this post, the key elements to note are 'existence', 'infinity', and 'quantitative'. Existence may be defined as that which may be defined and described by some quantitative means such that the means used in the definition may be employed to describe the thing which 'exists' at any other time the object or thing may be determined to exist.
Assuming the above definition of existence is valid, the fact existence is explicitly dependent on quantitative description creates a situation which defies use of infinity by definition. Using a simple example employing chemistry, an atom with 12 electrons and protons is always carbon. The number 12 is useable as a single value. Exactly how might one define an atom with an infinite number of electrons? Try to determine the actual number of electrons for an infinite atom of this sort; of course it is impossible.
If God exists in any 'physical' sense, then God exists and is not exempt from the definition laid out above. This may not be measurable by us, but that does not preclude the fact it still MUST be true.
If God is infinite or possesses ANYTHING of infinite value, even were some sort of mathematical proof leading in such a direction presented, the only conclusion one could make is that another frame of reference exists, wholly or partly undetectable by humans, in which these seemingly infinite values are measurable by some actual value.
As a final word, none of this has anything to do with my own religious beliefs or system of faith or in any way is a discussion of such. Possessing a method to deal with (and actually make use of) a concept as slippery to comprehend as infinity, particularly to assist in weeding out the truth in matters of biblical context, is always worthwhile.
And so, to finally answer the question....no....not all Christians.