1 John 2:15-16 ESV Do not love the world or the things in the world. If anyone loves the world, the love of the Father is not in him. (16) For all that is in the world—the desires of the flesh and the desires of the eyes and pride of life—is not from the Father but is from the world.
This is a sad but good question for us to ponder on and search the Scriptures on. And to answer it we should go to Scriptures for a shadow or example. Remember that Moses was used by God to bring Israel out of Egypt. We know that Egypt is a "type" or example of the world. In Numbers 12 we see the rebellion of Miriam and Aaron and God stands up for Moses. Then in Numbers 13 we see the rebellion of Israel. Their heart melted in fear and disbelief. We know that because of their unbelief they were to roam in the wilderness for 40 years before going into the promised land.
In Numbers 14 we find the answer of the original question of "Has the world invaded the church or has the church returned to the world?". They cried out in fear for their lives. They murmured again Moses and Aaron and confessed that they wish they had died in Egypt. Here is the answer: It is in Num.14:4
Numbers 14:3-4 ESV Why is the LORD bringing us into this land, to fall by the sword? Our wives and our little ones will become a prey. Would it not be better for us to go back to Egypt?” (4) And they said to one another, “Let us choose a leader and go back to Egypt.”
When things don't go the way we think it should go, when we are faced with a tough situation, it is in our nature to preserve our lives. Therefore, the church would rather get a new leader that will take them back to Egypt then risk dying for the promise land that God gives. In all the faith argument that Joshua and Caleb could deliver the only response they could get from the congregation was the decision to stone these two men of God. It was God's glory that saved them.
Numbers 14:9-11 ESV Only do not rebel against the LORD. And do not fear the people of the land, for they are bread for us. Their protection is removed from them, and the LORD is with us; do not fear them.” (10) Then all the congregation said to stone them with stones. But the glory of the LORD appeared at the tent of meeting to all the people of Israel. (11) And the LORD said to Moses, “How long will this people despise me? And how long will they not believe in me, in spite of all the signs that I have done among them?