2003 Nissan Altima Question: my car wont start. I checked the fuel pump, its pumping gas and there is spark?

ck crankshaft position sensor this is a big problem on these you may even have a code for it. poss recall from dealer or cust assitance program

You state you're getting fuel AND spark? need to make sure timing is correct. Also might want to check plugs to see if they've gotten fouled.