What parts of the Old Testament "count?"?

Some Christians say that various OT quotations no longer apply; yet others do. Some Christians seem to disagree with others about what parts of the OT count, and which do not. So how can non-Christians be criticized over and over again for pointing out what some say is a 100% "true,"... show more Some Christians say that various OT quotations no longer apply; yet others do.
Some Christians seem to disagree with others about what parts of the OT count, and which do not.
So how can non-Christians be criticized over and over again for pointing out what some say is a 100% "true," "infallable" book, and how can some parts be more infallable than another?

No disrepsect is intended. I simply see this pattern arising time and again with no clear distinction being made, even within Christianity.
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