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For example, regarding the Seventh Commandment, stealing a large amount or something essential or irreplaceable is usually a mortal sin. However, taking something small or insignificant, while a sin, may not be a mortal sin that excludes one from the kingdom of God.

This is nonsense and false teaching and calls into light the false teaching of "mortal" sins in Roman Catholicism.

The commandment against stealing does not differentiate between between stealing big hings or little things.

It is a prohibition against ALL stealing.

15“You shall not steal. Exodus 20:15 NASB

8Owe nothing to anyone except to love one another; for he who loves his neighbor has fulfilled the law. 9For this, “YOU SHALL NOT COMMIT ADULTERY, YOU SHALL NOT MURDER, YOU SHALL NOT STEAL, YOU SHALL NOT COVET,” and if there is any other commandment, it is summed up in this saying, “YOU SHALL LOVE YOUR NEIGHBOR AS YOURSELF.” Romans 13:8-9 NASB

It is a prohibition against ALL stealing.

All stealing is sinful, and all sin is prohibited.

Do you think a Christian who steals a paperclip is going to hell if he doesn't consciously repent of stealing the paperclip before he dies?

If you answer "no," then you, too, think that stealing a paperclip is a venial sin for Christians.

(You may in fact think that stealing *anything* is a venial sin for Christians, but your objection is not with the idea that stealing something trivial is a venial sin, but with the idea that stealing anything is a mortal sin.)