The biggest problem I run into in this particular conversation seems to be the automatic assumption that when we say you can't lose your salvation is the people take that to mean we are saying, "I'm saved no matter what and can now sin as much as I want with no worries". This completely ignores EVERYTHING being saved actually does inside the believer. It's as if the people making these arguments take no consideration of what the power or God actually does in our hearts when we are truly saved. To me this is the very heart of the problem, elevating our choice or "free will" as it's called, above Gods power. When we are saved our spirit is resurrected and reconciled with His Holy Spirit. This opens our eyes to the truth and makes us completely NEW people. This can't be "undone" any more than I can be "unborn". The Bible clearly tells us over and over that He keeps us by His power, He saves us by His power, He gives these things as gifts and grace, it doesn't have very much to do with what we think, feel, or say at all. In my experience and understanding of His word, however this understanding has been growing and changing since the day He saved me 9-29-13.
I too couldn't understand how I freely choose to "accept Christ into my heart" by my free will, yet now I'm saved I can't freely choose to reject Him now, if I wanted to? That made no sense to me at all, plus all the scripture that says clearly that we can lose salvation. I for sure thought we could lose the gift we choose in the first place. I'd always qualify that with "I don't know how anyone could" or "I never would", but felt we could lose salvation hypothetically. I had a smaller view of Gods power and a way larger view of "my choice" than reality reflects. We don't like it Gods in control of EVERYTHING, we just don't like it. On here all the time I hear in this debate off the jump it's "so God chooses who goes to hell from birth." "I'd never worship a God like that". Yet His word does say that, yet also tells us we do have choice, we do have a will. The thing is our will is enslaved to our nature, either that's in sin/Adam, or in Righteousness/Jesus. God is sovereign.
How does the sovereignty of God work with/through us and our choices to bring about His will, I don't know. To me that's where we stop being able to "get" it at all. Shoot half the stuff we think we "get" we are most likely off on at least a little bit. Just in my walk with Him this last 10 years has deepen/expanded/changed may lings and ways I see our Lord. I do not believe I can lose my salvation because of Him not me, and seeing the true price paid for this salvation, how much I deserve the complete opposite, and how this is nothing I could have ever even known about without His grace and power, I do NOT believe it's a license to sin my heart away, I see it as a undeserved blessing I want to live my life to glorify Him for. But that's just how I see it.