Not sure if you really need a comeback LOL, but Just ask them what their priest does each sunday in church.
Bread and wine representing the flesh and blood of someone? as well as other things.
That seems very occult to me.
You will be told that you misunderstand the process, to which you have a comeback which is so are you?.
Thankfully there is quite a large Reiki movement withing the RC church, many Nuns and Priests and monks do use it.
Namaste
Rob
Truth is not a property of language because language has not been able to express abstract ideas as efficiently as concrete items