Keep Calm and relax, you paranoid malaysians.

Small birds will usually pass through large jet engine (being diced, chopped, cooked and burned) without the engine really noticing; it may be stalled by a large amount of small birds, of a few large birds, especially water fowl which are known to swallow stones to reduce their buoyancy (so as to be able to dive to hunt fish) or to grind seeds in their giblet.

In the case where an engine stall, or is even destroyed by the bird ingestion, the design of the engine and nacelle is such that the engine will not blow up and send debris everywhere that will cause other airplane systems to fail (i.e. the engine debris are contained). This allows the aircraft to remain operational, save for the failed engine.

All commercial jet airliners have at least two engines, and are able to fly and even take off (albeit with a longer runway requirement) with one engine inoperative, hence a single engine failure is not the cause of an airplane no longer being able to fly.

In the rare case where all engines are inoperative, airplane do not crash. A plane is a glider first and foremost, the engines are there to keep the speed without loss of altitude and to maintain altitude without loss of speed (and to climb and accelerate as well). A commercial airliner will typically be able to glide for a distance that is around 15 times its initial altitude.

Birds do generally tend to keep at low altitude (as opposed to the 35000 ft cruise altitude of commercial airliners) and airliners will fly at around 250 knots at altitudes where birds usually fly (i.e. in the takeoff and landing phases).

Birds also have typically a very wide field of view, and fearing predators, will try to avoid very large fast objects approaching. This does not always work, however, but some effort is done by airport authorities to clear the immediate area around an airport from large concentrations of large birds, and to track and monitor the presence of birds. Pilots are also supposed to use the Mark 1 eyeball to avoid hitting birds if they can help it.

And finally, most crashes are not fatal. Fact is, the majority of people on board an aircraft going through an accident will walk away from it unharmed.
So, that is why there are few fatal crashes following bird impact, because your "if" propositions are not representatives.