I believe the Scriptures. I also believe I have the witness of the Spirit talked about in Romans 8:16.
I was just explaining this to another, so here is what I believe:
I don't believe God randomly decides who He is going to give the grace to see Him to. I believe God provides the prevenient grace to all to be able to choose Him, but only those who will choose Him in the end (based on His full foreknowledge of their life demonstrating the real choice they made with regard to Him not the immediately in-time often-emotional decision of a person) are given the subsequent grace of being born again by God. In time, it may look instantaneous, like "I made a decision and was born again." But, God isn't in time and He already knows our ending. There are many who made a similar decision to mine that will have looked every bit like me for a season, but then will walk permanently away from the faith for whatever reason. If the gifts and calling of God are truly without repentance (or not revoked) as we are told in Romans 11:29, then you can't become unsaved. And, if saving simply made in a one-time momentary decision, then, even if someone renounces God a moment later, God's salvation wouldn't be taken away and they would be bound by their one-time decision. I don't believe that. I believe God wants willing worshippers and isn't desperate to fill heaven with people who pastors and evangelists manipulated once-upon-a-time, but who don't really want Him.
Contrary to what some will claim, that doesn't make this a works salvation. I can't boast. Without God's major Gifts, I would still be dead in my trespasses and sins like everyone else. I couldn't have even made the choice without God giving me the grace to see Him and thereby choose Him. But, God doesn't give people His Word and His Spirit to walk like the rest of the world. His Word and His Spirit are not insufficient nor are they lacking effectiveness to do what God sends them out to do. For those who are truly His, not just professing to be for a season, He will accomplish their full salvation with their cooperation.