Mik, please cite your source for saying berachot loudly (more than enough for someone to ear so he can say “Amen” – and BTW, if a gentile says a blessing to Gd a Jew must answer “Amen” (Rema OC 215:2 and see http://www.hebrewbooks.org/pdfpager.aspx?pgnum=74&req=1809&st= for a different opinion ). It could be that as bnei Noach are commanded to believe in Hashem, at least to become chassidei Umot Haolam if one knows that the gentile will answer “Amen” it might be could to say it so that he can hear it after explaining it (use your common sense – it is the fifth section of the SA).
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