Final answer:
The biggest problems with Christianity identified include hypocrisy within the community, the secularization of its adherents, the history of proselytizing, and the struggle to reconcile religious beliefs with contemporary understanding of the world.
Step-by-step explanation:
There are various concerns that people express about Christianity, its beliefs and practices. One significant problem that people often cite is the issue of hypocrisy within Christian communities, where there can be a discrepancy between preached values and actual behavior. The historical quote reflects this concern, criticizing those who attend to the outward forms of religion while neglecting the more profound moral imperatives of justice, mercy, and faith.
Another frequent concern is the phenomenon of secularization, particularly in the developed world, where a growing number of people identify as Christians yet do not fully engage with or commit to their faith's teachings and activities. This has led to a diminished role of religious practices in daily life.
Additionally, there is often criticism of Christianity's past efforts at proselytizing and converting others, sometimes overlooking individual beliefs and cultural traditions. Regardless of Christianity beginning with a message of charity and universal love from Jesus of Nazareth, its development has included contentious issues of doctrine and identity, addressed through various ecumenical councils, such as the Council of Nicea.
Finally, some people struggle with reconciling religious beliefs with their understanding of the world, a sentiment echoed by thinkers such as Karl Marx and Sigmund Freud, who critiqued religion as being the opium of the people or an illusion based on childhood needs.