When you say you've "been religious before" are u referring to attending mass or attending a Catholic church regularly? Or simply that you've been interested in religion before? Within the Christian tradition (since that is what you're considering), there are a million different ways of doing things and different approaches--each with their areas that they excel in or need improving. The liturgy-heavy, repetitive, and highly symbolic nature of the Catholic church and other Orthodox traditions may not be the best place for someone with the doubts and questions that you have. If I were you I'd politely decline, and maybe pursue something a little easier to grapple with...something Protestant, non-denominational-ish. The focus there is more on relationships, is a little more straightforward, and focuses and less on traditions that may seem odd and uncomfortable. Just a little note: if you ever meet a religious group who tells you they know 100% that their beliefs are correct: RUN. No one has the answers, and the most honest and helpful religious groups will tell you that immediately.
