Stepping into the Kingdom of God is like immigrating to a new country: it has its own culture, laws, appetites, language, etc. You cannot come into the Kingdom and live by the culture of the kingdom of darkness; you have some changes to make in order to participate in the benefits it has to offer. Listen here.
The new birth is not saying the sinners prayer that works like a password or pin number that gives you access to eternal life....
The discipline of fasting