we have great difficult to define 怎么算“一旦得救”,
we can only rely on His PROMISE 信而受洗的 Bi4 Ran2 得救, nothing else.

Rom 8:30
预先所定下的人
又
召 他们来。
所召来的人， 又
称 他们为义。所称为义的人，
又
叫 他们
得 荣耀。

all because of GOD 召 称 叫

who 到底是被拣选的呢？ all those 信而受洗的!
who 不是被拣选的呢？ all those not 信而受洗的!
我说我不确定神是不是拣选了你 means 我不确定 你 信 or not,we can see other's heart,
we can see our own heart, so 我 should 确定神是不是拣选了我,
if 我不确定神是不是拣选了我 means 我 need to be humble to learn
those sound doctrines.

GOD do everything 召... 称... 叫得...
we got everything 信... 义... 荣耀...

right now, we, Lao2 Ku3 Tan4 Xi1,
信(bu4liao, bu4quan2, bu4jiu3)...
义(a little bit better than before but far from 义)...
荣耀 (reserved in heaven, but not ready to get it because of the compatability,
we can only be getting better and better but never could be possible to be there 义
till God completely give us Jesus' 义 required at the final judgment)...

I don't try to figure out everything by myself with my limited knowledge and experience, instead, I simply embrace those sound doctrines established
during the past 2,000 years