Why should we get baptised?
When we enter the waters of baptism, we’re proclaiming the gospel message. Jesus died for our sins, was buried, and lives again. By joining in baptism, we’re identifying ourselves with Him. Romans 6:4 says we have been buried with Him through baptism into death. We’re now dead to the power of sin. Being raised up out of the water expresses our new life in CHRIST and our union with Him.
What is Baptism? And why is it important?
If the meaning of baptism could be boiled down to one word, that word would be identification. Baptism speaks primarily of a personal, public identification with Jesus Christ.
In Romans 6:3-4 the Apostle Paul puts the matter this way:
Don't you know that all of us who were baptized into Christ were baptized into his death? We were therefore buried with him through baptism into death in order that, just as Christ was raised from the dead through the glory of the Father, we too may live a new life.
Notice the strength of the expressions—"baptized into Christ" and "baptized into his death" and "buried with him in baptism." Someone may suggest that the primary reference here is to Spirit baptism. That's true, but at the very least, water baptism is in the background of this passage.
How important is your baptism? It is your personal identification with the greatest act of human history—the death, burial and resurrection of Jesus Christ. Baptism doesn't save you—salvation comes by faith alone (Ephesians 2:8-9). Your guilt before God is removed the moment you trust in Christ. But baptism is your personal testimony to, and the inward assurance of, your passage from the old life to the new life...
Baptism - and what does it symbolize?
1. It means we have turned from the old life of sin to a new life in Jesus Christ.
2. It means we are publicly identifying with the death, burial, and resurrection of Christ.
3. It means we are openly joining the ranks of those who believe in Christ.
When you are baptized, you are in fact visually preaching the gospel. As you stand in the water waiting to be baptized, A, you symbolize Jesus dying on the cross. As you are lowered into the water, B, you symbolize Jesus buried in the tomb. As you are raised from the water, C, you symbolize Jesus rising from the dead.
And since you personally are being baptized, you are also saying, "I died with Jesus Christ, I was buried with him and now I am raised with Christ to brand-new life."
So, what is baptism in one sentence?
In short, in your baptism you are preaching a sermon without using any words at all. And your sermon in your baptism will be more effective with your friends than any sermon the pastor preaches on Sunday morning—more effective because it comes directly from you.
How did we get the word Baptism?
The Greek word translated “baptize” is the verb baptizo. According to most contemporary lexicons, the primary meaning is “to dip, plunge, immerse.” The secondary meaning is to “bring under the influence.” Dr. Merrill Tenney notes that “after making allowances for certain occasional exceptions, such as passages where washing is implied, the etymological meaning indicates that baptism was originally by immersion. (Basic Christian Doctrine, p. 257)
Let's see a few references from the Bible
Furthermore, the figures of speech used by the Apostle Paul accord well with immersion. Baptism is called a “burial” in Romans 6:4 and Colossians 2:12. Baptism is “into his death” and involves being “raised to walk in newness of life.” It is difficult to see how sprinkling or pouring could convey these meanings.Finally, the testimony of church history is that immersion was indeed the mode of baptism practiced in the early church.
Why should I be baptized?
Our Savior commands us to follow His example in all things, including baptism: Matthew 28:19 says, "Go therefore and make disciples of all the nations, baptizing them in the name of the Father and the Son and the Holy Spirit." At the beginning of His public ministry, Jesus chose to be baptized. John the Baptist was calling the Jewish people to confess their sins and demonstrate repentance through immersion in the Jordan River. Sinless Jesus joined the crowd at the river and asked John to baptize Him. The Lord chose to affiliate Himself with sinful man. When we follow His example in the waters of baptism, we're publicly confessing our faith in the Savior and identifying ourselves with Him.
Conclusion
Baptism allows us to demonstrate our connection with Jesus and with our brothers and sisters in Christ. We're all members of one body under the authority of the same Lord. But it's important to remember that Ephesians 2:8-9 says faith in Jesus Christ is the only requirement for salvation, not baptism. But, to fulfill His command, we're to be baptized following our decision to accept Him into our lives.
Source: https://www.christianity.com/jesus/following-jesus/baptism/what-does-baptism-mean.html