2004 Ford Focus Car Won't Start

Engine Mechanical problem
2004 Ford Focus 4 cyl Front Wheel Drive Automatic 122K miles

Hello, my name is Lisa, & I have an 04 Ford Focus. I recently got into a very minor accident with my car trying to avoid another car making an illegal u-turn. My car jumped a curb about 3 to 4 inches high & hit a stop sign. There was just minor scrapes to the bumper but immediately after the accident the oil spilled from the bottom because I damaged the filter from the curb & now it doesn't start at all. I was initially told that the filter needed to be replaced & the car just needed a jump but that didn't work. My mechanic is now saying the the motor needs to be replaced because the filter was damaged & I drove the car literally half a block to my house after the accident. When I attempt to start it the battery seems fine because the radio, A/C, lights, etc turn on but it refuses to start at all. Do you think my mechanic may be right?