When I read “Mere Christianity” I too felt that it expressed the faith of my family when I was growing up. And my parents (esp. my dad) were devout and knowledgeable Roman Catholics.
And Lewis was neither a Catholic nor a Calvinist so I guess his book lives up to its title pretty well.
But the one of his that is truly a must read is “The Abolition of Man”, and it’s very short. Most people could probably read it in an afternoon.
“Abolition of Man” is a great book. If anyone hasn’t read it, really recommend it.
And yes, Lewis was an Anglican and most definitely not a Calvinist.