Can anything challenge God's grace?

Moreover whom He predestined, these He also called; whom He called, these He also justified; and whom He justified, these He also glorified.

What then shall we say to these things? If God is for us, who can be against us?
Romans 8:30-31

Paul says predestined = called = justified = glorified. Could it be plainer?

If anyone could fall from grace, then the chain would be broken, and no one would be guaranteed salvation. If this were possible, then Jesus would be lying when He said:

All that the Father gives Me will come to Me, and the one who comes to Me I will by no means cast out. For I have come down from heaven, not to do My own will, but the will of Him who sent Me. This is the will of the Father who sent Me, that of all He has given Me I should lose nothing, but should raise it up at the last day.
John 6:37-39

When Jesus prayed for His disciples, He said:

Father, the hour has come. Glorify Your Son, that Your Son also may glorify You, as You have given Him authority over all flesh, that He shall give eternal life to as many as You have given Him...

I have manifested Your name to the men whom You have given Me out of the world. They were Yours, You gave them to Me, and they have kept Your word...

I pray for them. I do not pray for the world but for those whom You have given Me, for they are Yours. And all Mine are Yours, and Yours are Mine, and I am glorified in them.
John 17:1, 2, 6, 9, 10

Christ has all authority in heaven and on earth (Matthew 28:18). Jesus told some of the Jews:

I told you, and you do not believe. The works that I do in My Father's name, they bear witness of Me. But you do not believe, because you are not of My sheep, as I said to you. My sheep hear My voice, and I know them, and they follow Me. And I give them eternal life, and they shall never perish; neither shall anyone snatch them out of My hand. My Father, who has given them to Me, is greater than all; and no one is able to snatch them out of My Father's hand. I and My Father are one.
John 10:25-30

Now I'm going to start to show my hand. I'm not asking these questions just to rehash many of the things I've written about here before. I am leading toward something else. I want to follow these to their conclusion. I want us to better explore what a Biblical worldview really means.

Tough Question #6: Are we the defeated? Or are we conquerors?