Here are some better questions to ask Frank, that don't set him up.
1. What are the sources of your understanding of homosexuality? If possible, describe how they accurately represent, complement or differ from the Christian witness.
2. Please explain the method(s) you use to understand the Christian witness: how do you choose what texts you use to interpret an event in your life? When does a preacher misrepresent the Gospel? Under what criteria would you best judge your mistakes?
3. How do you see ethics generally differing from or similar to "Christian" ethics?
4. Explain the legitimate limits a Christian demands of sexual behavior. How do you justify those boundaries? How is the scriptural witness similar and/or different to your understanding? If different, upon what basis do you disagree with scripture? How do you justify this?
5. How does the church establish who is included in the Kingdom? Is it merely baptism or the taking of the eucharist? What are the fundamental criteria for discerning the difference between false and gospel teaching? How do you interpret scripture so that the written Word does not apparently contradict the Word?
5. How would you limit communion with another church? When is it justifiable to demand repentance from another church? How would this be enforced?
6. When might catholicism contradict or affirm republican or democratic polity?
These are real questions.