The HT-300 is equipped with stereo line level audio outputs, by means of a pair of standard 1/4" mono jacks. It can be connected to any system with a suitable audio input (the stereo outputs of the HT-300 can be combined together for use with mono sound systems).
The quality of the results you get will depend on whether your sound system was designed to reproduce music as well as speech. Many church sound systems utilise multiple small speakers, primarily designed for speech reinforcement, and are not suitable for high quality music reproduction.