There’s just one problem with this conclusion (that we will not be sinless until we are with Christ).
Christ said that those who attain unto the resurrection are as the angels in heaven (Matthew 22:30).
Matthew 22:30 does not say that we will become angels, but that we will be "like" the angels, a higher form of existence, from which the earthly conditions and limitations of this current life are eliminated.
The angels were not sinless, especially Satan. For if God spared not the angels that sinned, but cast them down to hell, and delivered them into chains of darkness, to be reserved unto judgment...what manner of persons ought ye to be in all holy conduct and godliness (2 Peter 2:4; 3:11).
The angels that rebelled and followed Satan were not sinless and Satan did not want to worship God, but instead, he wanted to be God. (Isaiah 14:12-14) Revelation 12:4 is understood to be a figurative description of one third of the angels who chose to follow Satan in his rebellion, becoming the fallen angels, demons. Unlike humanity, the choice the angels made to follow Satan or remain faithful to God was an
eternal choice. The Bible presents
no opportunity for fallen angels to repent and be forgiven. Nor does the Bible indicate that it is possible for the remaining angels who chose to remain faithful to God to sin. The angels who remained faithful to God are described as the "elect angels." (1 Timothy 5:21).
Why do some believers have the impression that they will be sinless in heaven?
What gives you the impression that we will continue to sin once we receive our glorified bodies in the presence of the Lord in the new heaven and earth? Our human bodies are described in 1 Corinthians 15:42-53 as perishable, dishonorable, and weak, because of sin. Our glorified bodies will be
imperishable, honorable, and powerful. Our new bodies will be no longer "natural" bodies with weak, sinful flesh, but "spiritual" bodies.
Our lowly bodies will be like His glorious body. (Philippians 3:21) The Bible also says in Matthew 13:43 that the righteous will
shine forth as the sun in the kingdom of their Father. Praise the Lord!
Are we going to have some power that the angels didn’t have? And where does the Bible say that it won’t be possible to sin once we’re in heaven?
Nowhere does the Bible say that the fall will be repeated in the new heaven. In Revelation 21:4, we read there will be no more death, sorrow, crying and neither shall there be any more pain: for
the former things are passed away. The wages of sin is death, so how can there be no more death if there is sin in the new heaven? Revelation 21:27 says, "But nothing unclean will ever enter it, nor anyone who does what is detestable or false, but only those who are written in the Lamb's book of life." Revelation 22:3 states,
"No longer will there be anything accursed." The curse of sin that entered humanity with Adam and Eve in the Garden of Eden in Genesis 3 will be removed.