Who told you that you can't have a child-like perspective on life while also being a successful adult? Not a Christian, but I respect the beauty of the New Testament. To reference Mathew 18: 1-4:
At that time the disciples came to Jesus and asked, “Who is the greatest in the kingdom of heaven?”
He called a little child and had him stand among them. And he said: “I tell you the truth, unless you change and become like little children, you will never enter the kingdom of heaven. Therefore, whoever humbles himself like this child is the greatest in the kingdom of heaven.
Some clever Christian scholars have elucidated on the meaning of this passage:
Not that we become immature and act childish in the traditional sense, but that we accept things in simplicity. Children have a way of believing everything you say and believing it as fact. It's only when we grow up that we tend to question everything. The currency of the kingdom of heaven is faith. It's what moves God's heart and what the great people of God are known for. So for the first part Jesus is telling us, "have faith like a child".
However, I will disagree on one aspect of that interpretation: children question everything! My Dad laughs as he reminds me that my two favourite phrases were "Dad, I got a question" and "But why?" Furthermore, this interpretation forgets about Genesis, when humanity was given "Da'at" (the apple), which is symbolic of the ability to question. To choose. As stated in a previous post of mine that explains the role of Satan/Lucifer in the Bible
The knowledge of good and evil inherently implies that one can choose between the two, after all... understanding the true difference between good and evil the delusion of paradise collapsed. For for them to accept their world as is as perfect would require as Sartre calls... Bad Faith... as they would not recognize their choice of being able to think critically and call bullshit on the fact they lived in paradise. You see, they never actually left Eden. It's like saying Christmas stops existing because you no longer believe in Santa. ... [Bad Faith] leads to a sin worse than pride (disobedience based on the assumption that given the knowledge available, you know better than God himself); wilful ignorance. Paradise must be lost, after all.
It's not a coincidence that I connected "Bad Faith" with refusing to question/make choices. To have Faith is a choice. Faith isn't lost, it's rejected.
Heaven is a place on Earth, after all. There is a classic and catchy pop song written about this
Any book that's been around for two thousand years and is still read by a billion+ people is worth your time. However, maybe theology isn't your thing. Have some David Foster Wallace to inspire you!
Two young fish are swimimng a long and happen to meet an older fish swimming the other way, who nods at them and says "morning boys, how's the water?" and the two young fish swim on for a bit and then eventually one turns to the other and says "what the hell is water?"
It can be argued that older fish was quite child like! How so? Remember your fables: wasn't it a child that pointed out that the Emperor had no clothes?
Finally, I was taught to care about money as a child. That said, care about money, but don't worship it.