Yes, it has been proven that terrorists have been using the refugee crisis as a trojan horse. Can you blame Trump for banning countries with an outpour of refugees that are being infiltrated by terrorists.No, Trump's excuse for it not being a religious ban was explicitly stated to keep terrorists out.
You're also referring to the Syrian refugees. What other countries on the ban list have had massive refugee crisis that caused violence and chaos in Germany and the U.K.? None.
It's already known that Trump has business interests in the countries he didn't ban. Hence, my analogy to Nazi persecution of gays but looking the other way for gay Nazis.
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The countries that his business interests lie with probably have nothing to do with an outpour of refugees, which you can't seem to understand.