He has every right to ask people what they believe on public property and the person has every right to decline to answer. That's why I suggested waiting outside. Definitely if goes into the church he probably be asked to leave and could run into potential legal problems. Hell he'll probably be asked to leave anyway out front if he asks really hard questions, but as long as he is on public property he's not actually breaking a law. At least that's how it would be in the US.
"The way to see by faith is to shut the eye of reason." Benjamin Franklin
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