The motive may be the maintenance of the US dollar as the basis of exchange for crude oil. The US fears the demise of the petrodollar. Any other currency, like the ruble, is a threat. Ever since the beginning of the Cold War, the Middle East has been a geopolitical playground for the Russians and the neocons of the USA.
Richard Land, who also headed the ERLC, had sound reasons why he supported Trump. If Clinton won the election, she would have stacked the SCOTUS with leftist justices who would have done irreparable harm to the US Constitution.