In Mere Christianity, C. S. Lewis targets those who think their religious beliefs don’t have to be specific. I like his colorful way of expressing his dissent:
A vague religion—all about feeling God in nature, and so on—is so attractive. It is all thrills and no work; like watching the waves from the beach. But you will not get to Newfoundland by studying the Atlantic, and you will not get eternal life by simply feeling the presence of God in Flowers or music.
Then, in one of his essays, he picks up on the theme of eternal life and spells out the necessary step:
A rejection, or in Scripture’s strong language, a crucifixion of the natural self is the passport to everlasting life. Nothing that has not died will be resurrected.
Amen.