A nondenominational church is a church that may have some, usually non-specific, beliefs and practices separate from those of the majority of Christians in general. Nondenominational churches are especially common in United States. However, this kind of worship has an interesting history. In many ways, the history of the non-denominational church closely mirrors the history of the Protestant Church. Many non Protestants were initially drawn to the Protestant church because of its non denominational focus. As a result, many Protestants are found in nondenominational congregations today, many of which are closely identified with the underlying principles and practices of the Protestant Church.
The main problem with the non-denominational churches is that there is a tendency for the leadership and membership to think of themselves as separate from mainstream Christians. This separation causes tension within the membership and can lead to debates and struggles between the members. For some, being part of the nondenominational churches means not having to commit to a specific denomination or beliefs. For others, belonging to these kinds of churches requires a commitment to a particular set of beliefs and a strict maintenance of these beliefs.
It is important to note that these kinds of churches have existed for years and are not a new phenomenon. They have been around for centuries and are very much a part of American religion. The biggest difference between them and traditional congregations is that the leaders and members of these nondenominational churches do not necessarily have to be part of a particular faith or church. They may choose to participate in nondenominational church events and activities, but they are not required to practice their religion in the same way as traditional churches. The Christians at the church in DC are free to pursue their religious beliefs in ways that suit them.
With this said, there are several key differences between traditional and nondenominational churches. The biggest difference is that most traditional churches require members to be committed to their beliefs and practice their religion in a consistent manner. These requirements are often very strict and are used as criteria for selecting members to the church. Nondenominational churches don't have this requirement. If a member chooses not to be affiliated with any particular belief system when joining, then they are welcome to join the church. The church in Washington DC allows members to practice their religion in a more flexible manner.
There are other differences between traditional and interdenominational churches as well. For instance, both require members to be active in their communities and attend regular services. While traditional churches are still very much a work of faith, interdenominational churches are becoming like congregations that meet regularly for socializing purposes. While some traditionalists may not like the separation of worship and community, others like it and see it as a benefit to the beliefs of the church. It can be seen as a way of encouraging the growth of a local Christian community. You can get more enlightened on this topic by reading here: https://en.wikipedia.org/wiki/Christian_Church.