If the Cross of Christ is not strictly the Object of our Faith, God looks at everything else as "worldliness." No matter how religious our efforts may be otherwise, it is still looked at by the Lord as "friendship with the world." This means the Believer, in essence, becomes an "enemy of God."
Philippians 3:17-21 King James Version (KJV)
ENEMIES OF THE CROSS DOCTRINE
17 Brethren, be followers together of me (be "Fellow-imitators"), and mark them which walk so as you have us for an ensample (observe intently).
18 (For many walk (speaks of those attempting to live for God outside of the victory and rudiments of the Cross of Christ), of whom I have told you often, and now tell you even weeping (this is a most serious matter), that they are the enemies of the Cross of Christ (those who do not look exclusively to the Cross of Christ must be labeled "enemies"):
19 Whose end is destruction (if the Cross is ignored, and continues to be ignored, the loss of the soul is the only ultimate conclusion), whose God is their belly (refers to those who attempt to pervert the Gospel for their own personal gain), and whose glory is in their shame (the material things they seek, God labels as "shame"), who mind earthly things.) (This means they have no interest in Heavenly things, which signifies they are using the Lord for their own personal gain.)
20 For our conversation (citizenship) is in Heaven (meaning the other ways will have no place in Heaven); from whence also we look for the Saviour, the Lord Jesus Christ (the Rapture):
21 Who (the Lord) shall change our vile body (the Resurrection), that it may be fashioned like unto his Glorious body (every Saint will have a Glorified Body), according to the working whereby He is able even to subdue all things unto Himself. ("All things" are done through the Cross.)
"All things" are done through the Cross. If you leave the Cross, you enter death (Romans 8:1-2, 6, 13)
JSM