1998 Mazda 626 engine not cranking

If your question is why won't my vehicle crank then you must word it that way. You made a statement. So assuming that I am correct in interpreting your statement then remember that cranking a car to start it and have it run requires a working Starting System. It includes the Battery, cables, Starter, Ignition switch and if automatic trans a neutral switch and a clutch switch if a manual trans. It is almost always a battery or battery cable problem but sometimes there are relays and wiring problems involved and the starters do go bad also. Try jump starting with another car and please be careful. Good Luck.