I’m Catholic so I might be able to shed some light on this.
en.wikipedia.org
Basically, a lot of Jesus’s teachings and many schools of Christian theology (sans things like the Prosperity Gospel) sees material wealth as something that can easily rot your soul. If you’re obsessed with material possessions and only focus on getting money and increasing your wealth, you usually don’t have space in your heart for God. Because you’re too focused on
this world and not the next. You’re too busy worshipping money to worship God. Jesus himself said excessive love and focus on wealth is intrinsically evil.
In the Gospels, Jesus reveres the poor as hardworking, modest, and faithful, unlike rich people who pay lip service to God and then go back to focusing on their fortunes. There is also a parable (Mark 12:41-44, Luke 21:1-4) about people making donations to temple: one is a poor widow, and the others are rich people. The rich people donate large sums of money to the temple while the widow only donates a few cents. Jesus says her donation is spiritually worth more than the rich people’s, because in her poverty she gave everything she had whereas the rich people are only giving from their surplus wealth.
Also, I wouldn’t go so far as to say all rich people are greedy and selfish, but it’s pretty obvious that greed and selfishness are common traits amongst the wealthy. Also, I’m order to obtain vast wealth, you usually have to step on and screw over a lot of other people (eliminating rivals, underpaying people, etc). Again, not saying that rich people are inherently bad, but the path to getting rich usually involves a lot of un-Christian behavior. I also hate to sound like a bitter armchair socialist but I would argue that most rich people do not use their wealth to improve the world for others, they only use it to improve their own lives. There are of course exceptions but that’s what they are,
exceptions.
So to answer your question, yes, Christianity for the most part assumes that committing sins is part of getting rich. And that material wealth distracts people from God.