Php 3:18 For many walk as hostile to the cross of Christ, of whom I often told you, and now even weeping I say it,
Php 3:19 whose end is destruction, whose god is the belly, and who glory in their shame, the ones thinking earthly things.
Php 3:20 For our citizenship is in Heaven, from where we also wait for a Savior, the Lord Jesus Christ,
Php 3:21 who will transform our body of humiliation, for it to be conformed to His body of glory, according to the working of Him to be able even to subject all things under Himself.
"wrong" god vs. "right" God.
Yet...
1Co 8:4 ...we know that an idol is nothing in the world, and that there is no other God except one.
1Co 8:5 For even if some are called gods, either in the heavens (the heavenlies, the heavens of men's minds) or on the earth; (even as there are many gods, and many lords);
1Co 8:6 but to us there is one God, the Father, of whom are all things, and we for Him, and one Lord Jesus Christ, through whom are all things, and we by Him.
Clearly many are not worshiping the "right" god and are worshiping the "wrong god". But it may also be that some are simply not WORSHIPING the right God. "For many shall say to Me then, "Lord, Lord..." Instead they are worshiping their "free" choices, or their doctrines and traditions, or their assumption of the rights and attributes of God, or whatever. I'll let the Lord sort us all out.