I use the word "miraculous" occasionally. It doesn't mean that I believe in miracles. It means that I find a phenomenon wonderful and unexpected, maybe inexplicable. Take the human brain, for instance. Thought is a wonder. It is amazing. I don't understand it, so I refer to it as "miraculous", but that doesn't mean that I think it's truly a miracle.
It's hard to give up words and idioms that carry supernatural connotations. I will probably not try very hard to give them up unless they cause problems in my life. In the case of human thought, I think it's miraculous, I just don't take an extra step and attribute it to a supernatural cause. That's all.