I do not have the time to comment on each of these passages, so I'll just comment on this one passage that seems to be a proof text for the IHTKMS* crowd.
A simple cross-reference of Galatians 5 and Acts 15 will show that Paul was describing the results of the Jerusalem conference on legalism (actual legalism - not what is being accused of legalism in our day). These new Jewish converts were being pressured to continue keeping the law. The Gentile converts were being told that they had to be circumcised to be saved.
Paul clearly denounces this legalistic false ideal and tells them that, if they go back to a life of trying to please God by once again keeping the law, then, "Christ is become of no effect unto you, whosoever of you are justified by the law..." If you are able to be justified by your own good works or observance of the law, then Christ's sacrifice was unnecessary.
He goes on to say, "ye are fallen from grace." He DID NOT say, "you have lost your salvation." In context, he is CLEARLY teaching that they have fallen from applying the doctrine of grace to their lives and have gone back to the doctrine of law-keeping. At no time did Paul tell them that were no longer saved.
Many evangelicals are mistaken on what Paul meant by law. He actually established a dichotomy between the law of Moses and the law of God. In Romans 7, for instance, he says the law and commandment is holy just and good and ordained unto life. Later he tells the Corinthians that circumcision (law of Moses) and uncircumcision is nothing, but what matters is keeping the commandments of God, (see 1 Cor. 7:19).
Of course one is not saved by keeping either law but we must be careful not to promote antinomianism. Paul certainly did not.
* I Have To Keep Myself Saved
