Please quote just what you responding to rather than quoting my entire post to repond with a line.. In any case, Psalms 119:160, all of God's righteous laws are eternal, so that is something that is directedly stated. So any instructions that God has ever given for how to do what is righteous are eternally valid, and if that were to ever change, then all of God's righteous laws would not be eternal. For example, the circumstances under which sex counts as adultery can change, but it will always be against God's nature to commit adultery.
In Deuteronomy 10:12-16, God wanted His people to circumcise their hearts and obey His commandments. In Deuteronomy 30:1-8, it prophesies about a time when the Israelites would return from exile, God would circumcise their hearts, and they would return to obedience to the Torah. In Ezekiel 36:26-27 and Jeremiah 31:33, the content is in regard to the Israelites returning from exile and the New Covenant, where God will take away our hearts of stone, give us hearts of flesh, and send His Spirit to lead us to obey the Torah, and where He will put the Torah in our minds and write it on our hearts, so they are describing God circumcising our hearts by means of the Spirit. In Romans 2:25-29, the way to recognize that a Gentile has a circumcised heart is by observing their obedience to the Torah, which is the same way to tell for a Jew, and circumcision of the heart is a matter of the Spirit, which is in contrast with Acts 7:51-53, where those who have uncircumcised hearts resist the Spirit and do not obey the Torah.
The issue of whether or not it is idolatry to eat meat offered to idols from the altar to to eat at home meat that had previously been offered to idols is a different topic than issue of whether we are permitted to eat unclean animals. Paul said nothing about eating unclean animals, so you should not insert that into what he was talking about and then interpret him as speaking against obeying what God has commanded. The bottom line is that we must obey God rather than man man, so when God has spoken against eating unclean animals, then even if it were a correct interpretation that Paul was speaking against obeying God, then we must obey God rather than Paul.
I'm pretty sure, though I'd have to look more into it. I know that provisions were made for people who were traveling from far away to exchange their tithe for money to be used to purchase what they needed when they God to the place where God would put His name, but it is not clear that it is meant for those outside of the land. A number of laws are conditional about living in the land.
I'm not sure what you are asking about today being what. People should join communities of believers and live in accordance with the rulings of the authorities of that community so that there is unity rather than everyone deciding for themselves.
Sorry about that.