your problem is you understood 預定 as TEACH or FORCE,
that is not true!

If 預定是指預定something such as 救恩,
you must conclude that you are saved
because you choose to be saved
and God's 預定 on this particular matter
based on His foreseen capability so the REAL reason
is your decision.

If 預定included Judah's betrayal to Jesus,
you must conclude God FORCE Judah to do bad thing
so that it equaled to God did that bad thing
according to your logic, thus, it is impossible
預定 Judah's betrayal to Jesus, because God never do bad thing
(here good or bad based on your judgement).

so you prefer to accept that
預定是指預定something good
never
指預定something bad
(here good or bad based on your judgement)
預定 blessings
never
cursings
預定 SiChuan WenChuan to be a beautiful place
never
預定 SiChuan WenChuan to be a center of 8.0 earthquake