I worry for the future of the Church. I had a recent conversation with someone attending a Church of Christ preaching school in which he said everyone who was not of the Church of Christ denomination was unrighteous.  I have heard before of certain denominations or individual churches believing they were the only ones saved, but was somewhat shocked that this was the spirit of a church I attend.

Is this the future spirit of the Church? The Bible tells us the righteous are scarcely saved. 1 Peter 4:18. And yet I have not found a congregation that worships perfectly. Where is that church, one that keeps the Ten Commandments and understands the gospel?

There are keys of Salvation that cross denominational barriers? 

1. John 3:16 Belief in Jesus
2. Mark 16:16 Correct Water Baptism
3. 1 John 1:9 Forgiveness After Baptism

Does the use of musical instruments in worship make one unrighteous? Does receiving sprinkling as an infant make a person unrighteous? Does not keeping the Sabbath make one unrighteous? 

It’s a matter of degrees from the straight and narrow. Being unable to discern God is accepting of both a cappella and musical worship may not make one worthy of damnation. However, believing you are holier because you only worship a cappella may be a stumbling block. Being sprinkled with water as an infant doesn’t make one unrighteous. However choosing not to read the Holy Bible to learn baptism requires knowledge of Jesus, knowledge of sin for repentance, and being immersed by another in the name of Jesus or in the name if the Father, Son, and Holy Ghost may jeapordize one’s salvation. Keeping the Sabbath is a commandment, yet we are told not to judge one another in regard to the keeping of holy days. Colossians 2:16.