You guys really are not paying attention to what Paul was saying there in Hebrews 6.
Heb 6:4-9
4 For it is impossible for those who were once enlightened, and have tasted of the heavenly gift, and were made partakers of the Holy Ghost,
5 And have tasted the good word of God, and the powers of the world to come,
6 If they shall fall away, to renew them again unto repentance; seeing they crucify to themselves the Son of God afresh, and put Him to an open shame.
7 For the earth which drinketh in the rain that cometh oft upon it, and bringeth forth herbs meet for them by whom it is dressed, receiveth blessing from God:
8 But that which beareth thorns and briers is rejected, and is nigh unto cursing; whose end is to be burned.
The matter is about those who literally turn away from Christ, knowingly. It's not about those in Christ that mess up at times and repent to Jesus. It's about one that once believed and also EXPERIENCED the gifts of the world to come, turning away from Christ Jesus, i.e., not believing anymore.
That is a particular matter of falling away, meaning to actually turn to the world that is against Christ. It has to do with the 'unpardonable sin' Jesus said that will not... be forgiven. Those gifts of The Holy Spirit are given to Christ's elect, so to be one of His elect and then turn away like Judas is... to fall away and commit the unpardonable sin.