OpenGL Object Rendering Order - c++

Question

Problem: Objects aren't rendering correctly.
What I tried to do: Searched Stack Overflow. Read that I needed to enable Depth_Test and did so. Still doesn't work. Read that I possibly needed glDepthFunc(GL_LEQUAL);, did not work. Is there something in the way I wrote reshape/initscene/myDisplay that causes these common approaches not to work?
Code below.
void reshape (int w, int h)
{
viewport.w = w;
viewport.h = h;
glViewport(0,0,viewport.w,viewport.h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
if (w <= h) {
glOrtho (-1.5, 1.5, -1.5*(GLfloat)h/(GLfloat)w, 1.5*(GLfloat)h/(GLfloat)w, -10.0, 10.0);
}
else {
glOrtho (-1.5*(GLfloat)w/(GLfloat)h,1.5*(GLfloat)w/(GLfloat)h, -1.5, 1.5, -10.0, 10.0);
}
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
void myDisplay() {
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // clear the color buffer
glMatrixMode(GL_MODELVIEW); // indicate we are specifying camera transformations
glLoadIdentity(); // make sure transformation is "zero'd"
glScalef(zoom, zoom, zoom);
gluLookAt(0.0, -9.0, 0.0,
0.0, 0.0, 0.0,
0.0, 0.0, 1.0);
glRotatef(y_rotation, 0.0, 1.0, 0.0);
glRotatef(x_rotation, 1.0, 0.0, 0.0);
renderObjects();
glFlush();
glutSwapBuffers(); // swap buffers (we earlier set double buffer)
}
void initScene(){
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
reshape(viewport.w, viewport.h);
glShadeModel(GL_FLAT);
glLightModelf(GL_LIGHT_MODEL_TWO_SIDE, GL_TRUE);
GLfloat red[] = {1.0f, 0.2f, 0.2f, 1.0f};
GLfloat white[] = {1.0f, 1.0f, 1.0f, 1.0f};
GLfloat gray[] = {0.5f, 0.5f, 0.5f, 1.0f};
glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, gray);
glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, gray);
GLfloat lightPos[] = {0.0f, 0.0f, -10.0f, 1.0f};
glLightfv(GL_LIGHT0, GL_DIFFUSE, white);
glLightfv(GL_LIGHT0, GL_POSITION, lightPos);
glEnable(GL_DEPTH_TEST);
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
glEnable(GL_NORMALIZE);
}