Heaven vs. Paradise

Mieko Kawakamiの "Heaven" を読み始めました。
主人公(男)とクラスメイトの "Kojima（女）"　は夏休みの最初の日に "Kojima"　が "Heaven"　と言う場所に行くことになりました。二人はクラスでの虐めにあっている生徒であり、文通で付き合っていました。

The train recited its script of sounds between the evenly spaced stations. Each time we came to a halt, the conductor called out the name of the stop. When he switched off the mic, it made a ticklish popping sound that made Kojima giggle. The rich green rice fields ran together, and little houses shot up between them. Keeping pace with the train, the sharp light flickering off pointed stalks flew into streaks.
"Hey Kojima," I said. "This paradise we're going to..."
"Kojima glared at me and shook her head.
"Not paradise. It's Heaven."
"Heaven?"
"Yeah. Heaven, with a capital H."
"Heaven," I repeated.
Kojima smiled. "That's right. But I'm not saying any more. You'll see when we get there. Sit tight."

私も "Heaven" と "paradise" の区別は余り意識していませんでした。 目的の駅に着いた後に最初に連れて行かれた場所は美術館でした。この美術館が "Heaven" かとKojimaに尋ねると Kojima は "Heaven is a painting" と応えました。
この際、英語で "Heaven" と "paradise" をどう区別しているのか辞書を見ます。

・Oxford English Dictionary:
Heaven: (in some religions) the place believed to be the home of God where good people go when they die, sometimes imagined to be in the sky
paradise:
1.(often Paradise) [uncountable] (in some religions) a perfect place where people are said to go when they die
2.[countable] a place that is extremely beautiful and that seems perfect, like heaven

Vocabulary.com:
Heaven: the abode of God and the angels
heaven is a place that seems absolutely perfect in every way. You can think of it as the lofty heavens up above, or as a place of everlasting bliss.
The places you think of as heaven could also be called "paradise" or "Eden." All of these words are based on a religious idea of heaven as a perfect, blissful existence that's granted to good people after they die. This spiritual heaven is generally depicted as the place where God lives, and is commonly described as being high in the sky. In fact, the original meaning of the Old English heaven, heofon, was "sky."

Paradise: In some religions, paradise is considered the ultimate destination, but in general, it's any place that is ideal and free from worry. Eden, Shangri-la, or even the corner nail salon — each might represent paradise to someone.
Paradise comes from the Greek paradeisos meaning "park, paradise, Garden of Eden." The Garden of Eden was a paradise free from all worries until Eve ate the apple that broke the dream. Often when you see advertisements for tourism in the Caribbean, a sense of paradise is evoked by the beautiful images and carefree descriptions.

頭が大文字の "Heaven" は神が住むところで "Paradise" はイブがリンゴをかじる前のエデンの園なのですね。　しかし、同義語としても扱われることも多いのが分かって安心しました。