 You're religious, you're legalistic. These are the insults Christians use against one another when they disagree on an issue. Sometimes out of conviction, compromising Christians use these insults to attack Christians who preach holiness. But what do they actually mean, simply put? To be legalistic is to trust in your works to accomplish what could only be accomplished through Christ's work, typically. When someone affirms the biblical truth that salvation is by grace through faith, nervous believers will add, but you're giving people a license to sin. When Paul wrote of the grace of God, he ran into the same issue, which is exactly why he had to clarify, well then, should we keep on sinning so that God can show us more and more of his wonderful grace? Of course not. Since we have died to sin, how can we continue to live in it? You can believe in both God's grace and the need for holiness at the same time. They don't contradict one another. Remember also that those who were rejected in Matthew chapter seven were relying upon their works to get them into heaven. Do we not do many wonderful works? We live holy not to be saved, but because he saved us.