I don't think people understand the nature of apostasy. This is from a Wiki article:
Apostasy in Christianity is the rejection of Christianity by someone who formerly was a Christian. The term apostasy comes from the Greek word apostasia meaning defection, departure, revolt or rebellion. It has been described as "a willful falling away from, or rebellion against, Christianity. Apostasy is the rejection of Christ by one who has been a Christian....
An example would be a Christian who rejects Christianity and all that means, and defects to Islam and the worship of Allah.
This would be to reject everything Christ has done for us and if that same person wanted to return to Jesus after renouncing him, and came back to him a second time, they would be crucifying Jesus over again. Hence we read this in Hebrews 6 and likewise elsewhere.
4It is impossible for those who have once been enlightened, who have tasted the heavenly gift, who have shared in the Holy Spirit, who have tasted the goodness of the word of God and the powers of the coming age and who have fallen away, to be brought back to repentance. To their loss they are crucifying the Son of God all over again and subjecting him to public disgrace.
I am sure in my own mind this is not going to happen to anyone here, so please people, keep calm and don't upset yourselves, we are all safe in the arms of Jesus. In Christian love.