First, a person can use biblical language and not mean what the Bible means. A clear example of this is the Arian controversy. Those who supported Arianism wanted to quote Bible verses about Jesus being a human and use that language. They highlighted those passages and that kind of ‘biblical language’ to the exclusion of other passages. This is why the Church held councils to hammer out this issue. This is why these councils used nonbiblical (not unbiblical) language such as homoousias, this was to keep or protect the biblical teaching. So to with the FV issue, just because someone is using the same words the Bible is (i.e. ‘elect,’ ‘baptism’) does not mean they are teaching the same thing the Bible is.
Second, this misses the whole point of theology. Theology is the Christian discipline of clarifying and systematizing the teaching of the Bible. In order to do this, by necessity, one has to use nonbiblical words. If all a person does is use ‘biblical language’ then they have done nothing to clarify the Word of God. The Bible can be confusing at times and it is the point of theology to use different words and different constructions to clarify the Word of God. The key is to be saying the same thing the Bible does, but in language that people can understand.
Hopefully this will move the conversation with the FVers forward and we can get to the heart of the issue and that is, who is saying what the Bible says.