I’m not willing to base my salvation upon or die for a conviction that it is absolutely wrong to use classes, cups, or instrumental music in the assemblies of the saints. In the first place my salvation is not based upon my being right or wrong about such issues. My salvation is based upon God’s grace through faith in Jesus Christ. This does not mean that God will not hold me responsible for my convictions relative to my knowledge and understanding of these issues. He expects me to be true to my convictions.
Secondly, convictions on these issues are matters of interpretation of the new covenant scriptures based upon one’s background, environment, hermeneutic, intellect, knowledge, etc. They are opinions, and scholarly, sincere, spiritual brethren have taken both sides of these issues. At times both sides have acted wrongly toward those holding opposing views. Some have pushed for their convictions irregardless of the convictions and feelings of others. Others have made laws to which they demand conformity. The results are/were divisions with each seeking to blame the other.
I cannot say it is absolutely wrong to use classes, cups, and instrumental music in the assemblies of the saints. That would be arrogant, condescending, and judgmental on my part. Neither can I say if it is wrong to use them those brethren who so do are going to hell. I am not their judge and I don’t fully know their hearts.
There are matters similar to those about which the apostle Paul wrote in Romans 14, “matters of faith”, not “the faith”. The greater and more important truth is not being right or wrong on such issues, but pursuing “the things which make for peace and the things by which one may edify another”. This can be done while remaining true to our own personal convictions. We haven’t done this though, choosing to show contempt for and being judgmental of God’s servants instead of manifesting “righteousness and peace and joy in the Holy Spirit.”