There is no such thing as "replacement theology". It is an idea prepetrated by dispensationalists to discredit non-dispensationalists. As your statement suggest, there is not ONE believer who would say God is finished with the Jews or anyone.
There has always been two groups-believers and unbelievers. The remnant of Israel (a subgroup of Jews) represented believers. If a Gentile became a believer (like Ruth), they became part of this Jewish subgroup. There was perhaps one exception (Naaman the leper) that I can think of. Gentiles, with Cornelius, were grafted into the remnant Jewish believers and the old ceremonial laws done away with. In fact the whole NT church were originally made up of Jewish believers prior to Cornelius. We were grafted into these Jewish believers and can thank God for their faithfulness.
The idea that God has a special and unique blessing for some who doesn't love His Son is just plain wrong and contrary to scripture. God does not look kindly on anyone who hinders the message of God-that salvation is through His Son, Jesus Christ.
1 Thesslonians 2:14-16 For you, brethren, became imitators of the churches of God in Christ Jesus that are in Judea, for you also endured the same sufferings at the hands of your own countrymen, even as they did from the Jews, who both killed the Lord Jesus and the prophets, and drove us out. They are not pleasing to God, but hostile to all men, hindering us from speaking to the Gentiles so that they may be saved; with the result that they always fill up the measure of their sins. But wrath has come upon them to the utmost.
I have met *many* five-point Calvinists (especially from the UK) that will straight up say that the Church is the New Israel, and that it occurred 70 AD
Interestingly enough, you would rather people read the Westminster confession above all else. (says so on your page). I expect you are a five point Calvinist.
I for one, do not follow the construction of men who build on the truths of scripture. If God had wanted the doctrine, he would have put it into the bible, plain and clear.
To believe you need Calvinism to understand the way of salvation is to say the bible is incomplete.