The Calvinists have a much more encompassing view than just that. It doesn't matter if you were born next door to a Calvinist church, attended it all your life, and did your best - if you're not among God's elected you were born to fry.
You may ask how do you know if you're among the elected. Apparently if you have to ask, that means you not one of them.
This means that the God who knew you in your mother's womb decided before your birth that you'd be eventually sent to his eternal fry cook and there's not a thing you can do about it. And that's the Calvinist God of ever lasting mercy and love.
Why would God do that?
***attended it all your life***
Are you saying just attending church will save you?