Yes I do, when they have other motivations for becoming a Christian. I think they will conform to the world. For example, the sorcerer who wanted to pay the disciples to be able to use the power of the Holy Spirit (Acts 8:17-19). This is someone who would still conform to the world because they want to become Christian so they can have magic powers.
However, I think some people are Christian and conform to the world because they really don't know how to change this behavior. For example, I was sexually abused when I was younger. When I would go to church, I didn't know how the two experiences would work together so I would try to look for an example of what I should do. How would being a Christian change how I could live my life even though this happened to me, but I never asked anyone and things like this are often kept secret. So I never change and I started to get angry until I had the opportunity for the truth to come into the light and I was able to talk to someone about the Bible and my abuse.
So I was Christian, but there were still secrets. So I would conform to the world because of this in some ways, but Jesus said, "So do not be afraid of them. For nothing is concealed that will not be uncovered, or hidden that will not be made known." (Matthew 10:27).
That is worth repeating, "do not be afraid of them," so when a Christian is conforming to the world, it probably means they are hiding something. The Devil loves when we are living in darkness and afraid to speak out. Therefore, I don't think this is always as malicious as people make it out to be because they want to reject Christianity for whatever reason. Therefore, they will look reasons to do this and use people who are struggling as a crutch that justifies their rejection of Christ.
However, there is power in the Holy Spirit and this will continue to set a person free for as long as that person continues to accept that Jesus is the Son of God.