Issues of worship
Although both the traditional Churches of Christ and evangelical Christianity often use the same Christian words and phrases, it usually does not take long before each begins to perceive the other has some significant differences in areas that one would think are universal Christian views.
A perfect example, I believe, would be over the observance of Christmas or Easter. For those outside the Church of Christ movement, one cannot help to be curious over why the Churches of Christ tend to make such issues so emphatically important. And conversely, there are those within the Churches of Christ who are often just as perplexed over why such worship practices go virtually unquestioned, unchallenged and are of so little concern among other Christian movements today.
To be rather candid, issues of worship sometimes become all important to those in the Churches of Christ simply because of their view of justification. If righteousness is provided to the believer only through their co-operation and obedience to ( the commands and laws of ) the New Testament, then it becomes imperative that we use the correct methodology and procedure in order to be saved.
Therefore, by understanding that the Churches of Christ often take this Old Testament approach to righteousness and apply it to the New Testament, we can certainly begin to understand their concern. As Deuteronomy 6:25 says, "And if we are careful to obey all this law before the Lord our God, as he has commanded us,
that will be our righteousness."
The good news of the Gospel, however, is that the righteousness God requires He also provides. Romans 10:4 says "Christ is the end of the law so that there may be righteousness for everyone who believes."
This is why evangelical Christianity believes that good works by Christian believers are the
result of their faith and the working of divine grace in them, not their own personal contribution to their own salvation. Christ is the only Savior. One does not save oneself.