I would look at it maybe as the Holy Spirit giving you an opportunity to witness to this lost man.
Honestly, it is so silly and childish you would wonder how these people could be so blind in the face of what God's word says. I quote them Ephesians 2:8-9 which plainly states works to not save....and they will come back and say baptism is not a work?!?! They come back and proudly proclaim they have studied Greek....well I respond....me too! What is your point? But it is worth noting they never explain how knowing Greek supports their position....and the one who occasionally, does try to use the Greek, only shows his gross ignorance of the language.
I have to assume that they don't accept God's truth because they do not want the truth. Jesus said, "This is the condemnation that light has come into the world, but men love darkness rather than light because their deeds are evil."
I believe one "evil" of the CofC is their abject pride in their church. They take great pride in condemning others pointing out that "their" church is the only true church....why it even has the biblical name of "Church of Christ." My personal opinion is that admitting their church teaches heresy is too much for them to accept....so the hold on to their false teachings and will not admit they are wrong. What a sad commentary it is that they are so proud of their baptism...in fact it is the most important thing in their lives, whereas in the true believer in Jesus Christ it is His atoning sacrifice and shed blood that is important to us. Yes, and living a godly life that honors His love and sacrifice for us. The 'gospel' of the CofC is not the Gospel of the Bible...but a false gospel of baptism. You ask one of the how to be saved...they will tell you...not you must be born again...but you must be baptized.
Think about this....in the coming Tribulation most of the world will believe the false prophet and follow the anti-christ and worship him. At the end of the Tribulation the nations will be fighting one an another, but when they see Jesus coming in the sky....they turn to fight Him!!
Romans 3:10f is so very true....man is a very sinful being. I makes the thank the Lord even more because somehow I heard the Gospel and believed and was saved.....!!! I think the difference between those who are saved and those who are not is simply....those who are saved...divorce themselves of pride and admit their are sinners and in belief repent.