We do, however (imo), still have the free will to deny Christ after we have received Him and thus give up our salvation.That would be what we call SIN, and the answer?
“Jesus said to them again, ‘Peace be with you. As the Father has sent me, even so I send you.’ And when he had said this, he breathed on them, and said to them, ‘Receive the Holy Spirit. If you forgive the sins of any, they are forgiven; if you retain the sins of any, they are retained.’ “
While many may turn from Jesus and even rebel against Jesus, I can't believe that any Christian would/could in his heart deny the existence of God...We have God inside of us and he ain't leavin'...
And while God may drag you home by the hair while you're kicking and screaming, and you may end up standing before God and everyone else naked, you'll still get there...