Yes. Heartfulness is based on direct perception and science rather than on religious beliefs, although the founders of all the great religions also based their teachings on their own direct perception and experience. Hence anyone from any traditional or religious background can benefit from these practices.
Until you experience something for yourself, you will tend to doubt it. The practices of Heartfulness grant us the experience required to convince our hearts. Realizing the truth for ourselves, we overcome doubt, while transcending the need for belief. To put it in a different way—our beliefs are now backed by experience.