A bachelor's degree in religious or interfaith studies is an inherently religious degree. This means that, while there are general education components that cover sciences, language and other educational requirements, your degree is meant to offer you a background in religious knowledge and understanding.
An interfaith and religious bachelor's degree is an entry-level degree that will help those who are looking for a career in a religious field. You could attempt to become a pastor or a religious counselor, or you could further your education to get a master's or doctorate in religious studies once you've earned your bachelor's degree.
It's important that you check the university you're attending and who accepts the bachelor's degree that you're trying to obtain. Some universities, particularly online universities, will have fine print that says where your degree will be considered valid and where it won't. If you're getting your degree for a specific purpose, make sure it advances your cause.
Depending on how many classes you attend per semester, you can finish your degree in between 18 months and 4 years. This varies by university/program, as well. A traditional four-year degree offered by a physical college is the most likely to be widely accepted and to give you the full college experience. Online degrees may be completed in less time, but they may not be considered valid when you try to get a job or advance your education further.