I mean, 2 Timothy 3:16 pretty clearly states that all scripture is God-breathed and useful. Romans 6 speaks to the being apart from the law, and yet not going on in sin because to serve (be a slave of) God is to obey Him. Romans 3 speaks to being apart from the law through God's grace, and yet not nullifying it because of that grace. So, the OT is definitely applicable today. The idea that we're not under Mosaic law but under the New Covenant is true (Romans 6:14), but what that means is that the only way to salvation is through Christ (John 14:6-7), and that we (as Christians) aren't expected to be perfect (by God's standard) to get to Heaven (Romans 3:23); not that we have no responsibility to obey the Law. What your viewpoint seems like (stepping away from Israel-Hamas), is that the Old Testament no longer applies since Christ came, and a dangerous assumption based on that principle is that we can do anything we want because Christ forgave us. I'm not saying you actually think this way, but this is what taking away from the importance of the Old Testament Law often leads to. Mosaic law is important, it's still God's word, and it still applies to us today. The difference is that unlike the followers of God before Christ came, we can enter God's grace even though we've broken His Law and so enter His grace apart from the Law. On a side note, Abraham was not exempt of the punishment of sin, or the responsibility to act uprightly, even though the Law had not been given to man, but Abraham still served the God who made the Law and punished evil even before Moses lived. So we as Christians are still expected to follow God and honor Him in life. One of the most basic ways to do that is to abstain from the things condemned in God's Word and obey His law (in the grace of Christ, because we fail). The Law defines good and evil, and thus, none of us can be saved by it (ergo, the need for Christ), but a misinterpretation of this principle is that the only thing we as Christians should consider is the New Testament. That is silly and foolish for many reasons. So, rabbit hole aside, the idea that Israel is also in the wrong because the only thing Christians should consider is the New Testament, and Christ said, "turn the other cheek," is false. there's more we have to consider, context to God's written Word that does not only include submissiveness. God is not a passivist (as evidenced throughout His entire Word), and neither should we be.