Faith of the Prophets versus the Faithlessness of Arminianism

"O LORD, You are my God; I will exalt You; I will praise Your name, for You have done wonderful things, plans formed of old, faithful and sure" (Isaiah 25:1). 

Recently, I have been in conversations with Arminians in which they claimed that predestination is based in foreknowledge. That part is fine. However, then they claim that "foreknowledge" merely means knowing in advance, denying any element of predetermination. Thus, they claim, God predestines those whom He knew

in advance would believe in Him. That imposes a tautology on God.

However, these Arminians build their doctrine on their (ab)use of one single word (used in various forms five times), and ignore everything else.

Note, for example, the verse quoted above. If that isn't predetermination, then language has no meaning. It makes no allowance for a passive deity, who merely rubberstamps the sovereign choices of men. The Prophet describes a God who makes and actualizes His own sovereign plans.

And notice, too, that Isaiah considers that concept one for which to be grateful!

So, when Arminians are doing their handwringing for the same thing for which Isaiah praises God, what are we to surmise about the faith of Arminians? 

For one thing, it certainly isn't biblical!