We Humanists aren't all that interested in religious piety. That is because we understand that piety does not guarantee virtue. Being virtuous requires you to be a good person. A moral person. Being pious only requires that you adhere religiously to your religion. And it is pretty obvious that not everyone who is religious is moral.
Being Humanists, we don't care what you believe, only that you are a good person. So, we are only really concerned with virtue. We seek to cultivate virtue in ourselves and seek out virtuous people for our friends.
Plus - it always seems like the more pious someone is, the more immoral they actually are. Like they are trying to cover up their immoral behavior with a show of religious piety. So, I always take conspicous religious piety with a very large grain of salt.