Religions/faiths have diametrically opposed truth claims. You have to study each carefully to see what they teach, and why. The enduring faiths are ancient, and were not organized around your modern day concepts of subjectivism, such as "this feels right to me and my personality, so I guess I will pick it." That's not how they work. Even Eastern religions, which are less focused on absolute truths compared to the Abrahamic faiths, aren't organized in such a way. You'll need to do some serious evaluation of faiths to find out what makes them differ, and realize it's not all about you, but about what the religion teaches.
In my case, I was raised Christian, but had a crisis of faith in my late teen and early adult years, becoming agnostic. I met the man who is now my husband at this time; he was, and remains, irreligious. However, I returned to the faith in my early twenties. Since then, I've sought clarity on doctrine, church history, and the like. I'm but one person, and I don't have the monopoly on the universe, so there's a lot to learn.
FWIW, Christianity was not initially divided into many denominations, and the Apostle Paul even warned against such things -- but as with anything humanity touches, it is now so, so I had to do prayer and study to figure out which branch seemed to understand and apply the New Testament the best.
Regardless of what you end up doing, as some have stated here, you also have to be open to the possibility that your future child may not follow what you do. My husband and I, since our beliefs differ, have discussed this many times. Also, my parents followed their own personal heterodox (and rather emotion-focused) views of the Bible; on the other hand, I've since sought out greater internal consistency with doctrine, and a more organized religious community. We had the same faith, but how we view and apply the details of it, differ quite profoundly in many respects.
Faith/religion is never easy, that's for sure.
