Churches usually preach that all sin will be forgiven if you ask forgiveness in the name of Christ (Yeshua). And then most sin will be forgiven, but not all sin the Bible tells us:
"For it is impossible for those who were once enlightened and have tasted of the heavenly Gift, and were made partakers of the Holy Spirit, and have tasted the good Word of God and the powers of the world to come, if they shall fall away, to renew them again unto repentance, seeing that they crucify to themselves the Son of God afresh and put him to open shame.", Hebrews6:4-6
For most church people this particular example will be a relief, because they were thinking about sinning against God's 10 Commandments (the NT Law for Christians, James2:10-11 by given examples in verse11) or sinning against their own body (sex with dead people, animals, family, same sexes, etcetera). But this example is about being a Christian that actually received God's Spirit/Gifts and refuses to be active (any longer) with those Gifts. Like the servant in Matthew chapter 25 not wanting to put the received "Talents" to use and instead buried them. Those Talents received are the Gifts of the Spirit!
"And I was afraid, and went and hid thy Talent in the earth. Lo, there thou hast what is thine.’
His lord answered and said unto him, ‘Thou wicked and slothful servant, thou knewest that I reap where I sowed not, and gather where I have not strewed.", Matthew25:25-26
Since churches don't teach this exception they have problems with Hebrews 6:4-6, but they found a remedy: their theologians declare that "the Book Hebrews is not for Christians but for Jews". Which is totally untrue, because all the letters are written to the first Christian assemblies, amongst them an assembly of Hebrew people. Also Hebrews6:1-3 explains just that saying:
"Therefore we must progress beyond the elementary instructions about Christ and move on to maturity, not laying this foundation again: repentance from dead works and faith in God, teaching about baptisms, laying on of hands, resurrection of the dead, and eternal judgment. And this is what we intend to do, if God permits."
Clearly the Christian foundation was laid amongst the Hebrews so they were Christians, but they are taught to go beyond their elementary Christian instructions what they are instructed to do.
Churches are worldly Christianity instead of Christian!
Unlike the Hebrews the churches are not Christian but worldly Christianity instead, because of their pagan church beliefs, days and rites. Their pagan trinity, biunity or just one godhead comes from Babylon.
Yet because of that pagan "all in one god" they have "the all in one baptism" supposing to lead them to all the parts of that pagan idol (father, son, spirit). They refuse the needed one true God YHWH Who is a Spirit (John4:24) and Lord Christ (Romans10:9, John17:3) with a risen body to the example of Christians (Romans 8:11). Thus church people do not receive God's Spirit; the cause of their idolatry! Not even when they practice the laying on of hands after the baptism that leads to Christ only, Galatians 3:27, Acts19:5).
Church people may argue that they then didn't commit a sin and cannot commit this particular sin. Which is utterly stupid to say and rest in, because without the Spirit/Gifts there is no Fruit of the Spirit, but only fruit of your own will called sin. And in order to be raised back to life/life eternal we -just as Christ did Romans 8:11- need that Spirit/Gifts:
"If the Spirit of Him who raised Jesus from the dead dwells in you, He Who raised Christ Jesus from the dead will also give life to your mortal bodies through His Spirit who dwells in you.", Romans 8:11
"if you confess with your mouth that Jesus is Lord and believe in your heart that God raised him from the dead, you will be saved", Romans 10:9.
"God is a Spirit ", John4:24
Church people turning Christ into God actually do sin against the 1st Commandment of God saying:
"I am the LORD (#Strong 03068: YHWH) thy God, which have brought thee out of the land of Egypt, out of the house of bondage. Thou shalt have no other gods before me", Exodus 20:2-3.
God's Name is YHWH or YAHWEH or short YAH/JAH.
Christ's name however is Yeshua.
By turning Christ into God a church member actually has other gods before God or even worse: a pagan god instead of God YHWH. Christians confess Christ as Lord of God, Romans 10:9.
Ps68:4 "Sing unto God, sing praises to His Name: extol Him that rideth upon the heavens by His Name JAH, and rejoice before Him." (AV).
Most church people willnot want to hear all this, refuse this and want to go ahead as usual. Like a good running worldly business you can't and won't step out of also because many loved ones are in that church carousel or died in it...
God however calls everyone of them out of that church Babylon!
Eternal Life & needed faith for it