How about you post some of that data instead of saying "there are mountains of data which proves you wrong"? Can you provide me with evidence that the Republicans and Alf Landon was actually interested in helping out in the war in Europe without Roosevelt spearheading the "let's help the Allies" movement? I'm talking about the plausibility of the US joining the European front under an Alf Landon presidency from 1936, so do keep that in mind.
Landon fought against the Neutrality Act and argued that Britain should be given $5 Billion ($88 Billion today) outright rather than go through Roosevelt's lend-lease policy. He wasn't an isolationist, and actually was offered a position on Roosevelt's cabinet in 1940 but turned it down because he didn't support Roosevelt having a third term as President. This is just with cursory research.
To put it another way: In WWI the United States had far weaker reasons to join the war at all, and far weaker reasons to join the side it did, than it did in WWII. Are you honestly arguing that the US is less likely to fight the Nazis than the Kaiser? In what world is that a logically coherent position?