What makes a Christian a Christian

As a Christian, I'm always finding myself in constant trials and persecution. Why? I hate being the odd person out just because I don't support what the world says I should support. I get made fun of at work about not knowing certain, wordly definitions. What can I do? This book will help and encourage believers all over the world, that, when in a trial, and going through persecution we have comfort that God will help us through anything.