“Gather My saints together to Me, Those who have made a covenant with Me by sacrifice” (Ps. 50:5 NKJV)
God created us for His pleasure (Rev. 4:11) and to achieve this, He has entered into a covenant relationship with us, based on sacrifice. Under the Old Testament, God entered into a covenant relationship with the children of Israel (Ex. 24:7-8), which was a model of the new covenant that He intended to enter into with all men.
The old covenant, which we also refer to as the laws of Moses, however was performance driven and God knew that the children of Israel did not have the capacity and the heart to keep all the commandments and ordinances contained in it (Deut. 31:16-21 & James 2:10). Instead, it made them religious because they became self righteous in the process.
God hates religion (Matt. 23:13-15 & Luke 11:42-44). Christianity is not a religion but a way of life. It is a relationship with a God that we know (1 Tim. 3:15). Jesus came to give us eternal life (John 3:16, Rom. 6:23, 1 John 2:25 & 1 John 5:11) and not to introduce a religion.
The law was given to serve as a schoolmaster to bring us to Christ (Gal. 3:24). The law was not an end in itself but a way to an end, to bring us into the inheritance that God promised us through Abraham (Gal. 3:29). The law was to guide and lead us until the manifestation of Jesus Christ (Jer. 31:31-33), it was not given to nullify the promise.
The old covenant did not have what was required to set man free (Heb. 9:9), so God had to introduce a new covenant, as the basis for His relationship with all men (Heb. 8:6-8). Faith and grace are critical requirements needed to operate the new covenant (Gal. 3:6). We must trust and depend on God. Our inheritance depends on the promise and not on our performance.
Under the new covenant, we can boldly approach the throne of grace (Heb. 4:16). We now have a new heart (Jer. 31:33), which is responsive to diligently obeying the voice of the Lord, observing carefully all the commandments which He has commanded (Deut 28:1).
For what the law could not do in that it was weak through the flesh, God did by sending His own Son in the likeness of sinful flesh, that the righteous requirement of the law might be fulfilled in us (Rom. 8:3-4).