If a church abolishes the law, how can they accept the New Testament law that says to love God with all our hearts and our neighbor as ourselves? The original Old Testament laws are wrapped up in these two.
Christian legalism looks like obeying a bunch of rules - women can't wear slacks or makeup, issues about hair length, etc instead of focusing on Christ's command to love God and neighbor.
When a church has no moral standards and no obedience but lots of legalism it looks like what the pharisees must have looked like in the past - lots of living by rules that made them feel like they were good people (outside of cup was clean, inside was dirty where it counts)