If you want to enter in to the kingdom of God, the first thing to do is to find out how to enter in.  Jesus Christ told apostle Peter  in Matt.16:19 ‘I will give you the keys of the kingdom of heaven: and whatsoever you shall bind on earth shall be bound in heaven: and whatsoever you shall loose on earth shall be loosed in heaven’.
Obtaining the keys makes you to enter in to all that God has prepared for you. On the contrary, if you do not have the keys, then your labour becomes the labour of the foolish who weary themselves to find the way into thje city(Eccl.10:15)( the city here meaning the kingdom or all God’s prepared provision for you.) Do you know that God foreknew you before the beginning of the world(Jer. 1:5; Ps.139:15,16) and has made a provision for you saying this is my path for you. You need to find God’s purpose for your life today. Stop beating about the bush. His thoughts concerning you are awesome. God bless you.
The first key is the  Salvation key. Without using this key to enter into a relationship with God, there is no reference point to your claim with God. Mark 16:16-‘He that believes and is baptised shall be saved but he that does not believe shall be damned’. This salvation key is broken into two parts; one the believing aspect and secondly the water baptism aspect. We shall look at these two keys as they present the basis for a true relationship and entry point to the kingdom.

The Believing Key
Believing here talks about believing the gospel message which basically is that ‘All have sinned and come short of the glory of God (Rom.3:23)and the wages of that sin is death(Rom.6:23) but Jesus Christ has died for our sins thereby suffering the curse of sin that was placed upon us and justifying us freely(Rom.6:24,25; John3:16) and that anyone who repents of his sins  and is baptised in the name of Jesus Christ shall be saved (Acts.2:38).  So, the believing key is simply believing that he must  repent and be baptised in the name of Jesus Christ to be saved. So the  response of the sinner here becomes to repent and be baptised in the name of Jesus Christ.
Repen­tance key
mental belief in the person of Jesus is not enough because even the devil believes in the person of Jesus and trembles but he does not repent or give his life to Jesus(, it takes true repentance to work the salvation key as presented in Acts.2:38!  Jesus himself said unless you repent ye shall likewise perish! (Luke 13:3). Repentance is godly sorrow for your sins and turning away from the evil and doing the right. This must be done first before water baptism or else it becomes a fluke. If you baptize without repentance you are doing a great damage to yourself.

The key of water Baptism
As mentioned in Acts 2:38, water baptism must be done in the name of Jesus Christ. Baptism is not sprinkling with water, it is immersion into water showing a burial(Rom.6:4).
Water baptism always becomes an issue at critical junctions of time. We are at such a junction of time today. In the exodus of the Israelites from Egypt, they had to be baptized in the red sea. In the coming of John the Baptist, they had to baptize for repentance. When Jesus Christ came, they had to rebaptise again for the remission of sins. We are about to go in the translation and you had better get it right.(see Acts 19:1-6 about those who had to get it right). There is no middle ground. You just must get it right now. THAT IS MY JOB TO TELL YOU!
History has it that every person ever baptized by the apostles in the Bible and baptisms conducted up to  three hundred years after Jesus was crucified and risen, was done in the Name of Jesus Christ. Not one apostle, not one Christian, at any time ever used the the titles “Father, Son, Holy Ghost” as NAME for baptism until the Catholic church was organized at the Nicene Council.