Something is unsettling about realizing that the habits that may be called harmless today once marked the line between faithfulness and failure.
Modern life often feels like a free-for-all where anything goes as long as it is legal, but history tells a different story about the faithful. If you could time-travel back to the first few centuries of Christianity, you would find a strict community that would likely be shocked by our daily habits.
Let’s dig into the history books to see which common modern practices would have gotten you in hot water with the church fathers. You might be surprised to see just how much the rules have changed over the past 2,000 years.
Lending Money With Interest
The early church fathers had a zero-tolerance policy for usury, which they defined as charging any interest at all on loans. They believed making money from money was exploitative and contrary to the teachings of Jesus regarding generosity and helping the poor. Today, the entire global economy is built on credit and interest rates.
If you tried to explain a credit card to a third-century bishop, he would likely call it a sin of the highest order. We live in a world where debt is normal, and financial institutions are essential to our way of life. According to Experian, total consumer credit card debt in the U.S. reached a staggering $1.16 trillion in the third quarter of 2024.
Serving In The Army
For the first three centuries, many Christians were strict pacifists who refused to join the Roman legions. Writers like Tertullian argued that once Jesus disarmed Peter in Gethsemane, he unbelted every soldier forever. They saw killing in battle as incompatible with the command to love your enemies.
Things changed drastically after Emperor Constantine converted, eventually leading to the concept of a “just war” theory. Now, Christians serve in the armed forces globally, and chaplains are a standard part of military units. It is a complete reversal from the days when joining the army meant automatic excommunication.
Watching Violent Sports
The Colosseum was the NFL stadium of the ancient world, but Christians were strictly forbidden from attending the games. They viewed the violence and bloodshed as a celebration of death that hardened the human heart. Church leaders warned that you could not drink the cup of the Lord and cheer for brutality.
We have swapped gladiatorial swords for tackles and knockouts, but the appetite for hard-hitting spectacle remains the same. Millions of us tune in weekly to watch athletes smash into each other for entertainment. In 2024, Super Bowl LVIII drew an estimated 123.7 million viewers, proving our love for physical contact sports is stronger than ever.
Working As An Actor
In the ancient world, the theater was associated with pagan worship and loose morals. The church fathers also believed that acting was a form of lying because you were pretending to be someone you are not. If you were an actor, you often had to quit your job before you could be baptized.
Today, we idolize actors and spend hours consuming the content they create on our screens. The idea that performance is deceptive or sinful has completely vanished from modern Christian thought. We treat Hollywood stars like royalty rather than social outcasts.
Wearing Flashy Jewelry And Makeup
Early Christian writers like Clement of Alexandria had plenty to say about personal vanity and expensive adornments. They argued that painting your face questioned God’s workmanship and that wearing gold was a sign of pride. Simplicity was the ultimate standard for how believers were expected to present themselves.
Fast forward to the present, and the beauty aisle is a staple of nearly every store. We see cosmetics and fashion as harmless self-expression rather than a spiritual failing. The U.S. cosmetics market size alone was valued at $67.54 billion in 2025, showing just how much we value our appearance.
Taking Oaths In Court
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Jesus famously taught his followers to “swear not at all” but to let their “yes” be “yes.” The early church took this literally, refusing to swear oaths in legal settings or to emperors. They believed that needing an oath implied you were usually a liar.
Now, placing a hand on the Bible and swearing to tell the truth is a standard part of the American legal system. Ironically, the very book that contains the prohibition is used to perform the act. We view oaths as a way to guarantee honesty, not as a lack of integrity.
Suing Your Neighbor
The Apostle Paul scolded the Corinthian church for dragging each other into public courts to settle disputes. He argued that it was better to be wronged or cheated than to shame the faith by suing a fellow believer. For centuries, the church handled its own internal conflicts without involving the state.
We live in a much more litigious society where lawsuits are a primary way to resolve grievances. It is common for people, including Christians, to lawyer up when they feel they have been mistreated. The idea of absorbing a financial loss for the sake of unity is rarely practiced today.
Getting A Divorce
While views varied slightly, the early church generally held to a very strict prohibition against divorce and remarriage. It was seen as breaking a sacred covenant that was meant to reflect the relationship between God and his people. Remarriage while a former spouse was still alive was often considered ongoing adultery.
Attitudes have softened significantly, and many denominations now have processes to handle marital breakdowns with grace. However, the numbers show just how common the practice has become in wider society. The Institute for Family Studies estimates suggest that 40% of first marriages in the U.S. will end in divorce.
Reading Your Horoscope
The Didache, one of the earliest Christian documents, explicitly forbade consulting astrologers or practicing magic. The church viewed these practices as seeking guidance from demons rather than trusting in God’s providence. Astrology was considered a dangerous rival to the faith.
Horoscopes are now a fun diversion found in newspapers and apps everywhere. Many people check their star signs daily without thinking it conflicts with their spiritual beliefs. A 2025 Pew Research Center report found that 30% of U.S. adults consult astrology or tarot cards.
Eating Rare Steaks
The Council of Jerusalem in the book of Acts laid out a few essentials for Gentile Christians, one of which was abstaining from blood. For a long time, the church took this dietary restriction quite seriously. Eating meat with the blood still in it was seen as a violation of God’s law.
Most modern Christians read those verses as a temporary cultural bridge rather than a permanent rule. We happily order our steaks medium-rare and enjoy blood sausage without a guilty conscience. The dietary laws of the first century have largely been left behind.
Gambling On Games
Early church leaders often associated gambling with covetousness and the pagan goddess of luck, Fortuna. They believed it wasted resources that should be used to support the poor and needy. To gamble was to trust in chance rather than in the provision of the Lord.
Today, placing a bet is easier than ever with apps right on our smartphones. The stigma has faded as sports betting becomes a massive legal industry. The American Gaming Association reported that sports betting revenue hit a record $16.83 billion as of November 2025.
Disclaimer: This list is solely the author’s opinion based on research and publicly available information. It is not intended to be professional advice.
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