I manage certain things in the church; the worshippers advised me to install sound systems. Is it necessary?
Churchgoers tend to be skewed towards the middle-aged and elderly who nearly always suffer from “presbycusis”, i.e. age-related hearing loss.
Not all persons can afford hearing aids so a sound system goes some way towards enabling worshippers to hear the sermons and dialogs.
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Your worshippers probably need help to hear the minister saying prayers and lessons. For this you need the people who are speaking to be wearing microphones which broadcast their voices through an amplifier and loudspeakers. If you have this then the amplifier can also drive a system to deliver sound directly to the worshippers’ hearing aids or earbuds. That system can be either a loop or an FM broadcast system.
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Yes. If you want it to be accessible for anyone with hearing loss (which is ~1/3 of your congregants over 50), yes.
Loop it, too. And then train whomever is speaking that they must use the microphone.
For an audience that might involve hearing aid users you need to consider that the optimal pick up range for hearing aids is about 2m. People sit much further from the talker than this. A loop system can works better than an speaker system because there is no distance issue.
Almost all churches need some sort of sound system, although depending on the architecture and size of the building, there are likely to be reverberations that will adversely effect the reception results. The 1/3-1/2 of the congregants who likely have some degree of hearing loss will benefit more from installation of an audio loop system, such as described in this website. Search “audio loop” or “hearing loop” for more information. The Hearing Loss Assoc of America has a sub-group devoted to promoting LOOPS.