If you sin after being baptized can you still go to heaven?

Yes. Everyone sins. It doesn't stop with baptism. That's what the communion is for, an ordinance through which you renew your baptismal covenant by repenting and cleansing yourself of sin weekly as you commemorate the Atonement, when Jesus Christ took on the sins of all humankind, and the Crucifixion, when Jesus laid his life down, his body and his blood, to raise it back up in the Resurrection so that we might all have eternal life free of sin.

Yes.  "If we confess our sins, He is faithful and just to forgive us our sins and cleanse us from all unrighteousness."  1 John 1:9.

Either one believes Holy Spirit baptism (Acts 1:5;8) was "THE PROMISE" (Acts 1:4) given when Jesus died and "the blood of His Son Jesus Christ cleanses us from all sins" (I John 1:7) for "Without blood there is no remission" (Hebrews 9:22).  

Afterwards we "Let not sin therefore reign in your mortal body, that ye should obey it in the lusts thereof" (Romans 6:12) for He has put His Spirit within us Who (((CAUSES))) us to obey His commandments" (Ezekiel 36:27) or we feel like a dog and repent to God (Psalm 32:3-4) and He "remembers our sins no more" (Jeremiah 31:34; Hebrews 8:12; 10:17)

OR

We believe in a powerless water baptism that doesn't put His Spirit inside of us (Ezekiel 36:27) or we would have (((POWER))) (Acts 1:5;8) "Spiritual gifts" (I Corinthians 12:7-10) and "Signs following" (Mark 16:17-18) received after Holy Spirit baptism (Acts 1:5; I Corinthians 12:13; Mark 16:16) nor does a water baptism "cleanse us from all sins" (I John 1:7) and gives "no remission" (Hebrews 9:22). 

Therefore "sin reigns in our mortal body" (Romans 6:12) for His Spirit isn't in you (Romans 8:9) to "guide us into all truth" (John 16:13) and He remembers every sin we commit since still "DEAD spirits" (Romans 5:12-14; I Corinthians 15:21-22) who haven't been "QUICKENED back to life" (Ephesians 2:1) nor "born again of the spirit" (John 3:5-7) as with Holy Spirit baptism (Acts 1:5;8).

If you don't believe me, look at all these different so called "Christian denominations" with all these law suits of pedophile in each organization who don't have "the mind of Christ" (I Corinthians 2:16) who has "one mind" (Philippians 2:2) and who believe "We all are sinners"

At the point of Holy Spirit baptism, we KNOW afterwards we are "Being justified freely by His grace through the redemption that is in Christ Jesus:  Whom God hath set forth to be a propitiation through faith in His blood, to declare RIGHTEOUSNESS  for the remission of sins that are PAST, through the forbearance of God:  To declare , I say, at this time His RIGHTEOUSNESS:  that He might be Just, and the Justifier of him which believeth in Jesus" (Romans 3:24-26).

IN CONCLUSION, IT ALL BOILS DOWN TO:

"But as many as received Him, to them gave He (((POWER))) [Received after Holy Spirit baptism; Acts 1:5; 8] to become the sons of God, even to them that believe on His name" (John 1:12).

CONSEQUENTLY, THAT IS WHY TODAY'S CHRISTIANS 

(((ARE SINNERS))) 

WHO BELIEVE IN A (((DO NOTHING))) POWERLESS WATER BAPTISM!

What is sin?

Is baptism real?

Everybody sins. What's the point of counting sins? Have you met anyone who isn't one?

Everyone sins.  To go to heaven, you have to repent of your sins.

Water baptism cannot get anyone into heaven, is not required to get into heaven, and cannot be added to what gets a person into heaven.  See 1 Corinthians 1:17.  You can't add any works to getting into heaven.  See Romans 4:5.  And all people saved and going to heaven still sin.  See 1 John 1:8.  Believing in the Lord Jesus Christ means being forgiven all sins past and future and means going to heaven and not hell. Nobody can be good enough to avoid hell.  So to avoid hell, believe in the Lord Jesus Christ. It is that easy.  When a person dies, they will be in heaven or hell, and they can't get out of hell if that is where they go.  To go to heaven and not go to hell, believe in the Lord Jesus Christ, without adding any of your works.  Believe in the Lord Jesus Christ, who is God and who died on the cross and shed His blood to pay for all our sins, and who resurrected from the dead.  See Romans 4:5 and 1 Corinthians 15:3-4.