“’He who is not with me is against me, and he who does not gather with me scatters. Therefore I tell you, every sin and blasphemy will be forgiven men, but the blasphemy against the Spirit will not be forgiven. And whoever says a word against the Son of man will be forgiven; but whoever speaks against the Holy Spirit will not be forgiven, either in this age or in the age to come” (Matthew 12:22-32).
“Every kingdom divided against itself is laid waste, and no city or house divided against itself will stand; and if Satan casts out Satan, he is divided against himself; how then will his kingdom stand?” (12:25-26).
One should understand the whole Bible and not assume that one or several passages save you.
Apostasy, contrary to some interpretations, is not the unforgivable sin. Like the parallel sins against faith—infidelity, schism, and heresy—it only becomes an unforgivable sin if one dies in it. Until death it is always possible, God willing, for an infidel to convert, for a schismatic to return from his schism, for a heretic to renounce his heresy, and for an apostate to re-embrace the faith of Christ.
If you can't admit that there are many, many scriptures in the bible that show and teach that Christians can not lose their salvation, you'll never convince me nor hundreds of millions of other bible believing Christians that you understand the bible...