I think you should if you find it uplifting. I was raised Catholic, and it is a form of meditation as well as repentance. Buddhists do something similar and also use a beaded necklace. If your worry that you'll offend someone by doing it because you aren't part of the religion, you could do it privately? Although, I would also think most religious people would say why not pray in that manner if it brings you comfort and peace? Can't imagine god could be mad at that whether you're part of the church or not. You could also do a YouTube search for prayer chanting as well, if you just like to listen to others.