No, bats were never birds, even though some humans supposedly guided by the Holy Spirit believed they were. And humans were never dogs, even though the Bible likens some humans to dogs!. Truth doesn't change with changing classifications. Science changes because sciencia is imperfect. Some claim the Bible is perfect even thouhg it is clear that it isn't.
But when one's entire faith and ego rests on the infallibility of a book, I can see why, some hold on to it tenaciously like a drowing man would hold to a straw, and stop at nothing to deny that which is obviously wrong in it.
How do you know that? What is your basis? It is because you define the word "bird" according to MODERN science, right? It has nothing to do with intrinsic truth, it is simply a matter of classification.
Truth doesn't change with changing classifications.
That's right, so why are you arguing AGAINST that idea? :) You are imputing intrinsic truth solely to modern classification systems. That is wrong. What are you going to do if 20 years from now scientists come up with an even better system that no longer considers bats as mammals? Suddenly, your scientific "facts" will evaporate overnight.