Because Christ said to, because it is how God saves people. But here's the question: If Calvinism isn't real, then why try to live right or witness to people? It won't do any good.If Calvinism is real, then why should I even try to live right, accept Christ or even witness to anyone?
Because God calls people to salvation and to be a part of his church.If my, and your eternity is already predestined, then why even bother with church?
If you are not one of the elect, then you won't believe Christ or trust him (which are the same thing by the way).If I am not one of the elect, then why believe Christ, much less trust Him?
To obey Christ, to fellowship with believers, to serve others, to worship God, to hear and learn the word, etc.If you are one of the elect, and your eternity is secure.....and I not one of the elect and doomed to hell....then why do you go to church?
No true Calvinist gloats. Calvinism removes any possible basis for gloating.Just to gloat?
God doesn't save or damn anyone without giving them a choice.Tell me why, if my eternity is predetermined before I was even born,,,,,,why should I spend even one minute wondering about it, or serving a God that either saves me or damns me without giving me a choice?
Methinks that you, like many, don't have a clue about Calvinism. But I encourage you to study the Scriptures. It made me a Calvinist when I didn't want to be one. But I had no choice when faced with the clarity of Scriptures.