The Act of Settlement prohibits any member of the royal family from marrying a Catholic without renouncing their rights to succession. Technically, William could marry a Catholic if she renounced her faith prior to the wedding, but this would be subject to the approval of the Sovereign after taking advice from the Prime Minister and the Archbishop of Canterbury.
I think it is extremely unlikely this will come up as William understands his future role as King and there are plenty of non-Catholics he is likely to encounter and marry at some point in the future.
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