I have actually unfollowed people, even close friends or family, who post nothing but religious stuff 24/7. At the same time, I've unfollowed those who do that with a lot of subjects actually.
Your friends and family are going to know you're religious, right? So if you want to post something every now and then, go ahead. It's okay. Don't make it constant if you're afraid of the feedback, but if it's really good, then okay, go for it.
Alternatively, you could join various FB groups that are aimed toward the topic, then post to those groups. Everyone else in the group will be expecting and appreciating the quotes/links, so no fear there. Or you could always share directly with friends who a quote reminds you of, etc.