"So if the Son sets you free, you will be free indeed" (John 8:36, NIV).
To be born again is about a relationship with Christ. The term "Christian" is a label that lets people know Who you serve, but it's up to God's children to seek a genuine relationship with Him. The word "religion" is a word that gets thrown around way too often, and I believe it confuses people because some will automatically judge a person based on the label put on their particular religion. In this case I'm referring to Christians, but it pertains to all other beliefs as well.
People's lives are based on living and learning through experiences, making mistakes, being in relationships, by making good or bad choices and through being close to their Creator and following their individual belief systems. There is a personal reason they've chosen to follow God or demonstrate their views in a certain way.
Those who use derogatory names or descriptions to describe a group of people (like Christians) are probably basing their opinions of the group off a few instances or experiences with people who sadly made all Christians look bad, such as false prophets or hypocrites claiming to teach the truth but who actually follow their own way. But, that doesn't mean all Christians behave in the same manner. I see some who claim they follow Christ, but their "fruits" don't show it (Galations 5:22-23). God knows the heart though, and He knows who's genuine and who's not (Jeremiah 17:10).
Nobody is perfect, but it's the very act of letting Christ help us to live the new life He's given us that proves who the ones are who at least try to do and be better human beings. True repentance is not based off pretty words with no real feeling or meaning behind them. To truly repent it must come straight from the heart. It has to matter to you whether you want real change in your life. It should come from the leap of faith you take when you tell Jesus you believe in Him and what He's done for you. Though the heart may sometimes deceive us, it doesn't mean God can't take up residence in there and gradually teach us the way to go in every circumstance we find ourselves in. It's the willingness to listen and act in accordance with the Word of God that He cares about.
New International Version. Biblehub.com. http://referencebible.org/topmenubiblehub3.php