Yes it's true that pain has a function (though there is plenty of pain
and suffering without an obvious necessity). But surely the Christian
hope is not just that we embrace suffering and learn to live with it?
Sure sometimes this is necessary in this life, but we have hope for a
life to come where "every tear will be wiped away". Paul suggests
that the only reason Christians should not be regarded as fools for
putting up with the persecution and suffering of this life, is that we
have a hope of resurrection.
Your answer seems to be saying that the pain and suffering of this
life is exactly how things were meant to be. Where then can we see
the fallen nature of this world?
"They told me I was gullible ... and I believed them!"