I did not grow up in a Christian home, so I didn't hear many sermons when I was growing up. I got my electrical engineering degree before I became a Christian. I know it happens in sermons. I also know it happens in scientific debates over non-theological subjects. As I said before, people are human and make mistakes.
Some people are dishonest and tell lies.
I am not very good at distinguishing the self-deceived from the intentional deceivers. To a certain extent, it is necessary to take quotes out of context. One can't quote the whole Bible every time someone asks a question about a theological issue. One can only quote the relevant passage. There is a certain amount of skill required to select a few short passages that most accurately summarize the Biblical concept.