All you have to do to be a True Christian is to follow Christ, but most so-called Christians do not do this. Even I have done so only fleetingly. It is difficult and a narrow path, indeed.
But Gautama Siddharth Buddha followed Christ, 500 years before Jesus was born.
So, what does "follow Christ" mean? It means to love others as if they were yourself and to wish for them everything that they desire. It means to turn the other cheek, if that's what they want, and to turn it effortlessly. It means to be not self-concerned in the slightest. It means to be fearlessly confident when you walk on water and heal the sick. It means to be utterly humble to the needs of others and responsible for everything they do to you.
Reading the Bible only helps you to undo all the damage and the distance of separation we have created. Reading it literally will accomplish nothing. This is one thing atheists and Fundamentalists share. Reading it from the viewpoint of spirit will see the wisdom that is otherwise hidden there.