Religious people like religious artifacts because it gives a tangible edge to their otherwise invisible faith.
I agree with that, many people need physical objects, symbols and what not to have something to cling to or identify with that represents the forces or beliefs they follow that they could not begin to fathom otherwise or do not understand. IMO, that is exactly why so many god(s) goddesses, natural forces etc. throughout time have been envisioned in ways that are generally very humanlike in look, form, emotions etc. in other words, someone or something that can be understood, boxed and identified with. I feel that many people have an actual need to understand and make sense of everything even if it might be an invention of the mind.
This is not to say that symbols/symbolism are not useful, symbolism, (images or beliefs physical or envisioned that evoke strong emotions from individuals or groups of individuals) can be used to bring forth and channel these very same energies, the trick is directing these energies into a useable tool. The power of these symbols are not ultimately inherent in the symbol itself but in the power the individual attributes to it and the energies they allow themselves to produce by that belief or attribution- it really comes down to the individual. I feel this really is the basis of all religous "magick" no matter what the religion calls itself. When religious "Magick" seems successful no matter the belief system, through prayer, ritual, ceremony etc. is it truly a "supernatural" occurence (that is through the power of God(s) etc.) or a result of the individual or group channeling energies that they themselves have either tricked themselves into evoking from themselves or knowingly doing so and directing them to the desired result? If so religious "magick" reasonably has absolutely nothing to do with invisible outside forces but are aspects and powers inherent in our humanity itself that we do not fully understand yet, at least this is my take on it. ESP, Paranormal etc. is generally considered "of the devil" or "the devils tricks" by Judeo Christian belief systems and many others, but there are many pastors and believers that have had "visions" from god, swear that prayer works and have had "god" tell them what was going to happen- yet this is all holy.
And then again, some people just have enough money to spend on trinkets that please them without a second thought about the what's and why's.