It is ironical that even today if one goes to Israel to settle as a believer, often they will have to swallow pride and be assisted by the Jews who have maintained more of an understanding of what it means to operate as a biblical community family that the church in the West.
I'm not familiar with the context of what you are saying here ...
Do you think Gods Hatred for Sin has changed ?
Can a church community be healthy with embedded abominations - not according to 1 Cor 5:9-13
God's hatred for sin has not changed, ... but His apparent methodology for dealing with sin appears to have changed.
According to my reading, the Old Testament is a lesson to humanity on how NOT to respond to sin. According to the Old Covenant, the response to sin leaves noone standing. And that doesn't particularly jive with God's creation of humankind in the first place. But ... we would have never believed that we could not live up to God's standard ... until He demonstrated that to be true. So, that is the purpose of the Old Covenant.
The understanding (from the Old Covenant) that humanity does not have the power (in itself) to live up to God's expectations ... should lead to at least some of us being open to the willingness to cast ourselves upon the offered grace of God. We want to be saved (i.e. to have a viable relationship with God), ... yet we know that we cannot meet th standard for such a relationship on our own, ... so we are willing to let God do it for us.
Under grace, God deals with His childrens' sin in a different way than in the Old Covenant. In the New Covenant (i.e. under grace), the payment for sin is no longer an issue (Christ having paid the penalty), so God focuses upon maturing His child to the point where child, themself, avoids the sin.
So the difference between dealing with sin under the Law ... and under Grace, ... is that, in the former case, the effort is to PAY for sin and eliminate it via fear of sanction, ... while, in the latter case, the effort is to make the childish perpetrator better.
As an example of this, take the instance of sin within the church which you referenced earlier (i.e. 1 corinthians 5). If this situation had been resolved according to the mandates of the Old Covenant Law ... And in similar manner to the Old Covenant examples you raised (i.e. Ai and Jericho) ... the offender would have been obliterated, ... probably within the witness of the congregation.
But that's not what happens. The Corinthians strive to TOLERATE the sin, ... at least until Paul upbraids them ... and compels them to put the offender out of the fellowship. But NOT to destroy him, ... but to turn him around to the acknowledgement of his non-conformity to the goodness inherent in God's instruction. And, indeed, this is what occurs ... with Paul following up and instructing the Corinthian church to readmit the former offender ... appropriate to his newly developed repentance.