> But isn’t that potentially problematic, that an interpretation of a verse could mean very different things based off how well it got translated?
The issue of translation is tricky. There aren't always exact parallels from language to language. Then's there are always the issues of "Do we translate it word for word (even if the meaning doesn't come through)?" or "Do we translate it by what it means (even if those aren't the exact words)?" And sometimes a word has many possible meanings, and translators have to choose what they think the author meant. In a case like this, where there's no context to go by, it can be difficult.
On top of that, and besides the language part of it, the worldview of the ancient culture is very different from ours. Sometimes they'll say something, and we know we don't see it that way any more—so then how do you translate it? (For instance, now that we know about the chattel slavery of Rome, and the chattel slavery of the colonial West [Europe and the Americas], whenever we read the word "slavery," we read it in our cognitive environment and in our worldview as the awfullest thing imaginable. But in the OT, that's not what "slavery" meant at all. It was mostly debt-slavery, sort of like our employment system. But sure enough, the word they use is "slave." So how do we handle stuff like that?"
As you can see, it can be quite the challenge to translate ancient texts. (1) That's why we have so many versions of the Bible [different approaches], (2) that's why new versions keep coming out [more information all the time], and (3) That's why scholars are continually at work to deepen and refine our understanding.
> Doesn’t that concern you? Something exists and the best God can do is essentially contain it?
It doesn't concern me because (1) God has an excellent plan to contain it, (2) He is dealing with it quite effectively, (3) In the meantime He is using it to His advantage, (4) He will deal with it when the time is right (Rev. 6.11). In my opinion, God is doing exactly what He can be and should be doing.
> “Why did God let sin begin in the first place?”
Let me try to explain it this way.
1. God can't sin. He has free will, but he's God, so sin is not an option. It's not even a possible direction.
2. But God is uncreated (both by nature and by definition), so anything He creates is not God and is less than God (hopefully that makes sense to you).
3. We were created with free will (necessarily so. Without free will, we wouldn't be able to think or do science or love—things necessary to be human).
4. Because we're not God, and are less than God, but have free will, sin is one of the possibilities for us. It wouldn't be "free" will if God said, "You always have to choose the good and the right."
5. So what God did (Genesis 2) is provide all kinds of good things for us, showed us how to choose the good and the right, made it possible for us to do so, and warned us of the consequences of choosing wrong. That's all anyone can do in that situation.
6. We chose to sin. God couldn't stop it, but He certainly had a good plan for how to deal with it when and if it happened.
Does that answer your question? Let's talk more if it raised more questions or if there's stuff you don't agree with.