“Then many will fall away, betray one another, and hate one another. Many false prophets will rise up and deceive many.”
Matthew 24:10-11 | cross ref: Mark 13:12-13 and Luke 21:16-17.

After Jesus was crucified, rose from the dead, and ascended into Heaven in AD 33, Christianity began to spread throughout the region from the early apostles’ work to teach the Gospel. Over the next few hundred years, true Christianity (adhering to the teachings of Jesus and the Bible) continued to grow with most believers meeting in each other’s houses to study, pray, and worship. However, in AD 125, the first group to splinter off from true Christianity was the Gnostics, rejecting Jesus’s teachings. Countless Christian schisms (a split or division between strongly opposed sections or parties, caused by differences in opinion or belief) continued over the next two millennium, with three major schisms occurring in AD 451, AD 1054, and AD 1517. Many of these schisms and their departure from Jesus’s true teachings included violence, betrayal, and hate. In AD 2025, there are an estimated 49,000 different Christian denominations which include major branches like Catholicism and Orthodoxy, as well as tens of thousands of Protestant, independent, and other groups. These denominations vary widely in size, belief, and practice, ranging from millions of members to fewer than 100. Many of which have abandoned the true teachings of Jesus. While the authenticity of a faith as broad and global as Christianity is hard to calculate, a study in AD 2022 by The Cultural Research Center at Arizona Christian University revealed a shocking 37% of Christian pastors have a Biblical world view. In addition to this, the largest population group (48%) within the Christian denominations is the Catholic Church. This is of note because Catholicism has strayed from the true teachings of the Bible and, if followed according to their traditions and rituals, is a false form of Christianity that does not align with the teachings of Jesus and the scriptures throughout the Bible.
This trending departure from true Christianity is not the only falling away though. Christian growth has been slowing dramatically over the past couple decades, especially in the West where secularism is on the rise, while Islam growth is increasing. So not only has Christianity branched off into many, many false versions of the faith, it is also slowing in growth. This shows that what Jesus prophesied almost 2,000 years ago about many falling away, betraying, and hating one another has come true, and is still happening today.
See History of Christianity via Wikipedia and Schism in Christianity via Wikipedia and Christianity via Wikipedia and Sectarian Violence Among Christians via Wikipedia and Christian Denominations via Lausanne and Stephen Rowland: What percentage of Christians hold Christian beliefs? via The Daily Herald and Status of Global Christianity, 2024, in the Context of 1900–2050 via Gordon Cornwell and 15,000 churches could close this year amid religious shift in U.S. via Axios and The Future of World Religions: Population Growth Projections, 2010-2050 via Pew Research Center.