So, now you're saved. Now it's time for regeneration to begin. The definition of regenerate, according to the Merriam-Webster Dictionary is: "formed or created again," "spiritually reborn or converted," or "restored to a better, higher, or more worthy state." There were more definitions. Yet, these particular ones explain the process of regeneration the best.
You see, we "come as we are," but we are not supposed to stay as we are. When you see people who've been in church all their lives, but they're still exhibiting the same behavior(s) they did before they got saved, regeneration never took place. They confessed Jesus, they may have even gotten baptized, but they never allowed regeneration to take place!
It tells us in (2 Corinthians 5:17) "Therefore if any man be in Christ, he is a new creature: old things are passed away; behold, all things are become new." God is asking on today, "Where is the new?" God is desiring true conversion.
Jesus already paid it all (John 19:30). However, it's up to us to receive all that He paid for. When He ascended, He left His Holy Spirit. When we receive Jesus Christ as our Savior, He comes to live in us. As we spend time with God we begin to grow stronger and stronger. wWe begin to " look" more like God. We become less flesh and more Spirit. This is what the scripture means that says to walk in the Spirit, and we will not fulfill the lusts of the flesh (Galatians 5:13). The more time we spend starving our flesh, and feeding our spirit, the stronger we will be spiritually.
There will always be some areas(s) that we will have to bring before God (Romans 3:23). However, if we say we have received Jesus as our Savior, we should be pressing towards the mark (Philippians 3:14). We shouldn't be making Jesus look bad, but instead looking more and more like Him, daily!
We do this by, spending time in prayer, spending time in the Word (Bible), going to church, spending time with other believers, and fasting. Then we will be effective witnesses for Christ.