Romans 8:29 "For whom he did foreknow, he also did predestinate to be conformed to the image of his Son, that he might be the firstborn among many brethren."
There is a danger for the saved person to conform to the world. There is much in the world that is a real temptation for that person who is saved to go the way of the world. The saved person is to be ever conforming to the image of Jesus Christ. Conforming to this world will damage and ultimately destroy the testimony of that saved person.
The devil hates us!! The world is a powerful tool of the devil that he uses to tempt us to conform to the world. He will use places we should not be going. He uses ungodly friends and co-workers. He uses ungodly music. He uses things we consume or take into our body. He even uses clothing. There are many temptations.
The thing is...with all the temptation we face...the choice is ours whether we give in to that temptation or not. The one who chooses to give in to that temptation is conforming to the world.
The saved person that follows God and keeps His commandments is conforming to the image of Jesus Christ. We need to choose to follow Christ. How do we know what to choose? Well...if it is something the Bible plainly speaks of as pleasing to God...do it. If it is something the Bible plainly warns against...don't do it.
I Corinthians 10:31 "Whether therefore ye eat, or drink, or whatsoever ye do, do all to the glory of God." If what you're faced with the choice of does not bring glory to God...don't do it. And if you're not sure what to do...I've adopted a saying a long time ago..."when in doubt don't". Don't do it until you've prayed about it and sought God's Word for an answer. Then if God gives you peace and assurance to go ahead and do it...do it. If you would feel comfortable doing it if Jesus were right there with you...then do it. After all...you do take Him everywhere you go if you're saved. He only lives in your heart. If you would be ashamed...don't do it.
So let me ask you...who are you conforming to? This thing of conforming is a day by day...minute by minute thing. You may have been conforming to the image of Christ yesterday and not today. You may even have been conforming to His image five minutes ago and not be now. So be careful who you are conforming to.