Love the ice cream analogy!
Short Answer: I’m going to answer the question posed in the OP, “Need one study comparative religions to be religious?” with a “No, one does not need to.”
Long Answer: Ok, here’s my qualifiers. I don’t think anyone’s religious beliefs are owed more respect than anyone else’s. Granted, I personally would probably be more interested in chatting up a person who had studied many religions in the course of pursuing their spiritual path, but I wouldn’t base “respect” as such on that. Whatever ice cream you serve in your home is your business, and I respect that, even if your reasons for choosing that ice cream are not exactly the same as my own.
(A disclaimer on my qualifier: I’m not talking about any brands of ice cream that are marketed specifically to fund, say, white supremacy, which I think is a different discussion, agreed?)
In the course of usual events, most people are exposed to different religions, and ice creams. You attend weddings and funeral services held in various houses of worship. Your college roommate might be of a different faith. You don’t necessarily have to set up a blind tasting of different ice creams in your house (although people certainly can if they want to), but you can still enjoy the free samples handed out to you as you go through life. If anything about them intrigues you (wow, this ice cream is completely great and unlike anything I’ve ever had before!), the person who served you the ice cream is probably willing to give you some more information about it’s history and um, ice cream beliefs (ok, this is getting a little thin). If you are not bowled over by the ice cream you are served at your best friend’s wedding, you can do what any polite person would do, finish up your sample to the best of your abilities (i.e. sit quietly and attentively in church, but remain seated for communion) and go home and enjoy a big bowl of your own ice cream.
I agree with the statement that “religion is intensely personal,” but I would ask that you not be so quick to dismiss the “because your parents did” scenario. For many people, the feelings of family and community are a big part of their spiritual life. It’s essentially secular, yes, but the tradition and history of your family’s association with a religion can be an important component of your experience with your church. I realize this is not a part of everyone’s spirituality, nor does it make one a “better” church goer. If you have elegant cut crystal ice cream bowls that were handed down to you from your grandmother, why not use them as you serve ice cream to your family? It doesn’t make the ice cream taste better, but it can add an additional special touch.
I don’t have much respect for people who boldly refuse to acknowledge other religions – now I’m talking about people who refuse to attend the wedding of a colleague because it will be a Hindu ceremony, someone who loudly objects to a prayer said before dinner when they are a guest in someone else’s home, or ignores someone’s request for Kosher food. But I don’t think the problem with these people is a lack of comparative religion, I think the problem is that they are nasty self-centered jerks.