Mosiah 16:6 - 16:10

Mosiah 16:6 And now if Christ had not come into the world, speaking of things to come as though they had already come, there could have been no redemption.

Abinadi therefore speaks of a future event like it had already taken place. If Christ had not come, no redemption would have been make for us.

Mosiah 16:7 And if Christ had not risen from the dead, or have broken the bands of death that the grave should have no victory, and that death should have no sting, there could have been no resurrection.

And if Christ had not risen from the dead there would be no resurrection. If there had been no resurrection then separation of spirit and body would have been permanent and we would never had a chance for more personal growth in the celestial kingdom.

Mosiah 16:8But there is a resurrection, therefore the grave hath no victory, and the sting of death is swallowed up in Christ

But since Christ was able to bring about the resurrection, death is not permanent. The separation of the body and spirit is only temporary because of the sacrifice of Christ.
[It is interesting to me that Abinadi is not continually condemning these people. He speaks of Christ and his sacrifice with the hope that thinking about it will cause a change of attitude. By centering our thoughts on Him, we become less self absorbed and more willing to be fair and honest with our fellowman. We have less desire to take advantage and want to be more loving and kind. Pointing fingers and calling people evil and sinners on a constant basis does not work to change attitudes.]

Mosiah 16:9 He is the light and the life of the world; yea, a light that is endless, that can never be darkened; yea, and also a life which is endless, that there can be no more death.

So Christ becomes the guide we all should follow. He has all the right moves for us to make and He will never ever fail to do the right thing all the time unlike any of us. He has overcome the seemingly permanent state of death so that if is only a temporary state.

Mosiah 16:10 Even this mortal shall put on immortality, and this corruption shall put on incorruption, and shall be brought to stand before the bar of God, to be judged of him according to their works whether they be good or whether they be evil—

So at a future time, we all will be resurrected whether good or bad. And we will be brought before God for an assessment of our behavior and attitudes while mortals.
[Here Abinadi is trying to get king Noah and his priests to think about this future judgment and be concerned about what their own personal rewards all be. Hoping that it will scare them enough to change.]