I just wanted to add that I believe certainty is healthy, considering some issues and situations. For example, I am certain that marriage should be a vow that is honored by both until one person dies. I am certain that marriage is intended for that, imo. I am certain that two people who plan to get married should know each other, and that's a different timetable for different couples.
However, I am not certain that EVERY marriage should be saved. Marriage and it's intent is different from marriage and what's best for the couple. There are a myriad of reasons why a marriage breaks up, which I think many are petty and avoidable.
But I also understand the bearing that upbringing has on a person's thinking, patterns they see as a child influences that child. I knew someone who was dating a girl. He was very mild-mannered, but she kept trying to start fights. And you know what she said? "My parents always fought, and since we don't fight, it doesn't feel real." Like, really? His parents were civil in how they handled disagreements and he never even saw them hash it out. So yes, while I believe in certain design for marriage, I also understand that people are complex and there are many factors.
So, I wouldn't then follow up what I certainly believe marriage to be with "every married couple should stay together no matter what (unless one is unfaithful, which in one very, Jesus only uses the word "unfaithful" - that is open to interpretation)." Or "Every marriage ceremony or wedding we see is sanctioned by God."
I could go into why the Bible itself can prove confusing concerning the requirements of marriage. I won't. I'll just say if you want to argue that the standards God sets as sin and not sin never change, then there would need to be some explanation beyond "mention of is not approval of" but there is A LOT of "unbiblical" marriages that are not rebuked, but are done by people who are highly esteemed in the "Hall of Faith." Yet their rebukes were for different things. You would think a rebuke would be in there somewhere - it's not. Only that nonchalant, put away divorces were wrong.
Another thought:
There are other issues. But the thing about a relative approach to the Bible, is that it liberates you to explore. If I find something that seems a contradiction, my faith is not shaken, because it is not dependant on the text. It is only dependant on Jesus, and my understanding and my search. The text is something you can see, you can hold it. It easily becomes an idol; it did for me. And I know I struggle still with idols in my life. But true faith cannot be an idol, nor can you see it, nor can you prove it, or wrap it and give it to someone. You are not giving someone faith or truth just by handing them a Bible - you are giving them a book, written by people and interpreted by people. If your faith itself relies on the authenticity of a book, it is far from unshakable, but laid upon the sand. If your faith is in words, and the superiority of an argument - then it is not faith, but reason and that's it. You can't argue someone to faith, and there is no formula in way of presentation that converts all men.
I know I've contradicted myself in the past. I know I've set up strawmen before and used ad hominem attacks. And I know I will continue to falter in my knowledge, in my search, in my arguments. I know I will pull my foot out of my mouth once again. Because I know I'm human, I know I'm a sinner, and I expect that I will make mistakes - I don't intend on them.
But when you accept that, that you can't even make yourself sinless - that you can't understand YOUR OWN HEART enough to change it, you then realize just how little power and knowledge you have. If you can't understand YOURSELF, what makes you think you got God figured out? And yes, you could say Jesus is the answer - I believe He is. But when you accept you will never arrive, and because you don't understand your own heart, then sinlessness or perfect understanding is not longer a stress, because that's no longer your goal. When you accept you can't know the God in an certain, absolute terms, then you don't even try - so your ears are truly open.