Remark that it would be more than your life is worth to call Muhammad a "pedophile."
Explain that, of course, you understand that in seventh century Arabia when the Prophet married nine-year-old Aisha, child marriage was considered an entirely normal, healthy thing; who are we to judge to other cultures?

Psalms 118:8 It is better to trust in the LORD than to put confidence in man.
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Scarlet Chord Ministries   Isa 1:18