Life is a good thing. I don't think there's anyone who would argue that. In the beginning, God created life. In fact, given that there are plenty of potential times I probably could have already died, God sustains life in an active and involved way. There are many times where He gets involved in the nitty-gritty. It's not always obvious in the moment, but usually looking back you can see His fingerprints like they're glowing in the dark.
Yet, even though this is the case, in Romans Paul makes the claim that life, this very life God gave us and wants us to have abundantly, can separate us from its maker. In order to see how this could happen, it's easiest to simply take a trip down memory lane.
In times of struggle and difficulty, I turn to God. It's then that I cry out, asking God 'why oh why' and begging for an answer. Begging for a miracle. Begging for something that will transform my life. Sometimes He gives it, sometimes He doesn't. But when He does, the most natural response I have is, "I did it." God may get me out of the stickiest situation, but as soon as I'm out it's like I never asked Him for help. Recognizing God's hand in our deliverances is a huge part to preventing life from tearing Him away from us.
You see, we have the tendency to blame God for the messes and thank ourselves for the clean-ups. It seems quite common. It's this blessed life of living as a follower of God that can do exactly what Paul says can't and shouldn't happen: tear us apart. But if we're not careful, it can. We need to remember to get down on our knees and thank the ultimate deliverer.