All of them.  There is no such thing as a permissible sin.

Anger, envy, pride, greed, gluttony lust. sloth and a few more.

Unbelief and blasphemy

John 3:36 KJV — He that believeth on the Son hath everlasting life: and he that believeth not the Son shall not see life; but the wrath of God abideth on him.

Matthew 12:31-33 KJV — Wherefore I say unto you, All manner of sin and blasphemy shall be forgiven unto men: but the blasphemy against the Holy Ghost shall not be forgiven unto men. And whosoever speaketh a word against the Son of man, it shall be forgiven him: but whosoever speaketh against the Holy Ghost, it shall not be forgiven him, neither in this world, neither in the world to come. Either make the tree good, and his fruit good; or else make the tree corrupt, and his fruit corrupt: for the tree is known by his fruit.

 i dont have a religion to set me such borders kid

Do I find it strange, to hear you say that you are a believer?

There is no small sin, and the big sin, sin is sinful, that is why the sinner can go to hell, if he, does not ask God for forgiveness, and does not convert to Him, will remain in his sins. In the Holy Bible there is no grave sin, and little sin, it is written:

Romans 6:23.For the wages of sin is death; but the gift of God is eternal life in Christ Jesus our Lord.

Every sin that God shows us in our own lives.  It's usually those sins which so easily beset or ensnare us (personally) - which in every person's case are different things we haven't recognized on our own such as pride, (God really hates pride because it is what was found in the Devil and look what it caused - it caused Satan to be thrown out of heaven - Jesus saw Satan fall like lightning from heaven Luke 10:18)) - is that what we want as Christians - to be banished from heaven for eternity where God our Saviour is and be thrust into outer darkness where there is no God or Jesus Christ to light our way and our world?  

Then there's theft - (being dishonest on our taxes which is stealing from the taxman), arrogance - thinking we are better and not as bad a sinner as others - thinking we are above others and better than others and all those sorts of things - I could go on and on but each one of us must go to God personally and ask Him our faults, so we can repent.

Enjoying life pretty much covers them all. 

The serious sin or grave sin that GOD would never forgive is in ascribing partner to HIM , by calling Jesus as the son of GOD. GOD is the Lord of all the worlds who have no partner. So the only true religion of GOD is the one which GOD send it down for all mankind for them to lead their lives from the beginning of the human race till the end of time to come, for them to become successful both in this world and the hereafter.

According to saint Vyacheslav Krasheninnikov, when chipped people are sent signal by computers, they will go receive World Passport (grey plastic card with no name on it)... but when they stretch their hands to get it, gov't clerk presses secret button to administer green 666 by isotope rays on forehead or wrist. This tattoo leads to permanent hell. Police will mark people on highways. Food stores will mark people too. Antichrist will release prisoners and insane asylum people (to help him mark people) as well. So, hide within a 10-15 people group (saints Gabriel Urgebadze and saint Seraphim of Sarov) with no documents and no electronics; forgive me.

Charles Darwin's false theory of evolution.