Galatians 4:6

6 And because you [really] are [His] sons, God has sent the [Holy] Spirit of His Son into our hearts, crying, Abba (Father)! Father!

We really are now God’s children and because we are His kids, we now have the Holy Spirit just as Jesus has Him. Just as Jesus is kept by the power of the Holy Spirit, so are we. Jesus came and allowed Himself to be sacrificed so that we could have everything that He has. Jesus has died to sin once and because of what He did for us, so have we.

Because we know that Christ (the Anointed One), being once raised from the dead, will never die again; death no longer has power over Him. For by the death He died, He died to sin [ending His relation to it] once for all; and the life that He lives, He is living to God [in unbroken fellowship with Him]. Even so consider yourselves also dead to sin and your relation to it broken, but alive to God [living in unbroken fellowship with Him] in Christ Jesus. Romans 6:9-11

We are the body of Christ right now, Ephesians 5:30, so we too are dead to sin and alive to live as one with God. Our relationship with sin has ended. We are now free from the law of sin equals death. 

Because we are members (parts) of His body. For this reason a man shall leave his father and his mother and shall be joined to his wife, and the two shall become one flesh. This mystery is very great, but I speak concerning [the relation of] Christ and the church. Ephesians 5:30-32

For the law of the Spirit of life [which is] in Christ Jesus [the law of our new being] has freed me from the law of sin and of death. Romans 8:2. 

7 Therefore, you are no longer a slave (bond servant) but a son; and if a son, then [it follows that you are] an heir by the aid of God, through Christ.

We are now an heir of God by His direct aide through Christ. It is only by our Father’s grace that we are saved, it is all His gift to us, Ephesians 2:8. Our Father decided to give us life in Christ and our Father never withdraws His gifts once they are given.

For God’s gifts and His call are irrevocable. [He never withdraws them when once they are given, and He does not change His mind about those to whom He gives His grace or to whom He sends His call.] Romans 11:29.