Boanerges
I agree with you that our theology shouldn't come from the book of Acts. However, I would say that within the book of Acts we find examples of how the apostles preached the gospel to the unregenerate.

You are of course correct the inference of Acts 13:48, is 'limited atonement'.
However, I don't think we can say from that particular verse, that the apostles preached 'limited atonement' in their gospel presentations.
Don't misunderstand me; I am with you that in one way or another 'limited atonement' should be preached to the unregenerate.

Tom