Most proponents of the theory try to show evidence in the bible (for Once Saved Always Saved), for example:
However, the inability for Satan to snatch us from Jesus' hand simply means that Jesus is more powerful than Satan. It means that Jesus is the Good Shepherd, who never turns his back on the flock. He always remembers us and will never leave us.
But consider for a moment that Jesus refers to his obedient children, who are keeping his commandments, and that this does not stop one of his flock from leaving him, and backsliding against his commandments.
Jesus says he gives us ETERNAL life (the proponents stress ETERNAL, implying that we cannot lose it once we have it). But consider for a moment that Eternal Life refers to the moment after being judged and arriving in heaven, not when we are born again. Consider that being born again is the time that we accept Jesus into our lives, and commit to living like he did. We are then the good children who pick up their cross and follow him Daily.
That view allows the possibility that one may lose their salvation, if for example, they became a preacher (after being born again) who started blaspheming the Holy Ghost in front of the church. Could this pastor not lose his salvation despite being born again? Some say, Oh but that is the unpardonable sin. Yes, then consider the pastor who was born again at the age of 14, who eventually started a church and slowly stole more and more of the church bank account to fund lavish personal material objects, such as jets, and defrauded the church. That pastor did not blaspheme the Holy Ghost, but certainly did not follow Jesus' examples.
Eternal life is a gift that we do not deserve. We dont achieve eternal salvation all at once when we are saved, we instead promise to walk in Gods way when we are saved, and then Jesus hands us the gift of eternal life when we are judged by Jesus.
How do you arrive at that conclusion, brother in Christ? The way we arrive at this is by listening to the opinion of over 50 people on YouTube who have toured Heaven and Hell with Jesus (either from an NDE, or a vision, or a dream). They lived to tell about the experience, and the solid consensus is that Lukewarm, Unrepetant, and Backslidden Christians have been seen in Hell. Most of the time, the story behind the Christian is understandable: they were born again early in life, went to church and thought they were saved and forgot to repent of their new sins. Or, they committed horrible acts, such as the pastor stealing from the church funds. But consider the lukewarm Christian, who uses Christs blood like a playground. For one, who has neither forgiven others and held grudges, that lukewarm Christians repentences may not have been heard. For another, who was worldly, attended church, but failed to spread the gospel to a single person (especially her girlfriends).
After watching these on YouTube, I decided my duty was to summarize the theology behind this concept.
As you can see, the above biblical examples have probably been misconstrued - to allow people to believe they can be saved once in some haphazard manner and then sin the rest of their lives.
Unfortunately, many churches use the same logic to maintain revenue (IE a constant revenue base exists).
As you can see, if you have a little patience and realize the meaning may be Eternal Life after being judged, you may decide it is better to live like Paul the apostle did: "I pummel my body and lead it as a slave".
On a side note, the bible never actually contradicts itself. We as humans misinterpret things. In our case here, it is more logical to follow what the bible does say about the subject, leading us to believe that we can lose our salvation if we are not Good Christians:
For example, Hebrews 10:26 states: “If we practice sin willfully after having received the accurate knowledge of the truth, there is no longer any sacrifice for sins left.” (Hebrews 6:4-6;) (2 Peter 2:20-22)
Earlier in his life, he recognized that he could still miss out on salvation if he gave in to fleshly desires.
He wrote: “I pummel my body and lead it as a slave, so that after I have preached to others, I myself should not become disapproved somehow.”—1 Corinthians 9:27; Philippians 3:12-14.
The unrepetant souls. Those who commit sins as a Christian and do not repent.
21 Warning Signs of Becoming a Lukewarm Christian (Video)