My reaction in no particular order:
1. Jesus Movement reach the 70's too. Both hubby and I came in toward the end. And very odd, he was a hippie as were his Christian friends, but they through-pure-naivety took to the closest church they could find. The AoG. Quite the freak out for some of the members, but the pastor was willing, so they blended mostly, and some of the middle-class folks left. (Mom wouldn't let me be a hippie. lol)
2. (Don't drink anything while reading the following, or something might come out your nose. lol) Honestly, when I saw your post, right before I had more stuff to do, I thought, "I know he wants me to be diplomatic, but I'm no diplomat. And, I'm gonna be blunt sometime because it would take forever to get to my point being all diplomatic." Did you get that humor? Yeah, me? Worried about taking forever to get to a point. lol But, honestly, if I had to go all diplomatic my post would take 3 times as long, so I was worried about that, but...
3. What you say I have to do anyway. I'm reformed (the word we prefer compared to Calvinist), believe modern End Times isn't really a thing biblically speaking, not a 6,000 y.o. earth believer, (not an evolutionist or "billions and billions of years" believer either, so I really don't have the right hole for my particular peg), and I'm fluctuating on the gifts thing, in an equally bizarre way. But, hey, I really don't have much against folks who believe other ways. Either it simply doesn't matter, or it does but not enough to end fellowship. So, yo, much easier than what I thought you were going for.
4. But I do have a question about this paragraph.
It's a problem brought to me directly from my upbringing. The RCC. You ask a Catholic if they believe all that, and they won't bat an eye while saying they do. BUT, they don't. Ex Cathedra is equal to Bible. And Salvation isn't really by faith, it's by works -- whether the confessional, the penance, or praying to knock people out of purgatory. So, what if someone says they believe the essentials, but don't?
So, how to deal with what they say isn't what they mean?