Adiaphora in Christianity refer to matters not regarded as essential to faith, but nevertheless as permissible for Christians or allowed in church. What is specifically considered adiaphora depends on the specific theology in view. (WikiPedia)
The question we must constantly deal with is what is essential to our worldview and what is not. It is important to understand that things can be relevant without being essential. This does apply to worship practices, to take but one example. The issue arrises when things stop being “adiaphora” and become “demonic” to our faith and our worldview. Then the real problems start.