These doctrines are not found in the Bible. They were imported into Christianity from paganism by the Catholic church in order to make their "theology" more palatable to their masses of pagan converts. They used isolated passages of scripture, taken out of context, to support these notions.
One God or a Trinity: https://www.thisisyourbible.com/library/show/1036
Jesus: God the Son or Son of God? https://www.thisisyourbible.com/library/show/169
Heaven and Hell: https://www.thisisyourbible.com/library/show/41
After Death, What? https://www.thisisyourbible.com/library/show/43
Do You Believe in a Devil? https://www.thisisyourbible.com/library/show/162
For a detailed discussion of many of the specific passages often quoted in support of these unscriptural notions, you might want to go to the following website:
Wrested Scriptures: http://www.wrestedscriptures.com
I hope you have found this helpful.