A) Has the Society ever taught anything scripturally incorrect?
Yes. Of course they have. They freely acknowledge that.
1B) Might the Society be teaching anything scripturally incorrect now?
Yes. Of course. The Scriptures indicate that only when Jesus arrives in his glory will the ultimate truth be revealed.
1C) Are Moslems as certain their religion is right as Witnesses are?
Perhaps. But conviction is no substitute for faith in Jehovah and Christ. They have a zeal for God, like the apostle said, but not according to accurate knowledge.
2A) At Armageddon, will ALL non-Witnesses die? (If not, who lives?)
Everyone who calls on the name of Jehovah in faith will receive his salvation. You figure out where all non-Witnesses stand in relation to that revealed truth.
2B) Do you believe a loving God would kill over 5,000,000,000 people?
That is a basic misunderstanding that apostates have been dismissed with. The truth is that a large percentage of the world is going to be destroyed in a genocidal holocaust. Jehovah steps in at the end of that period only to execute vengeance upon those who executed his own children. At that point during the world's most horrific period of bloodletting, Jehovah will be fully justified in annihilating the remaining worldlings who reject his salvation.
2C) Why has the Society said the end is "soon", every day since 1884?
Because that's what Jehovah's watchmen are commissioned to do.
3A) Why would a "just" God punish billions for Adam and Eve's error?
Wrong question. Why would a just God resurrect billions of unworthy ones and give them everlasting life?
3B) Why would a "just" God give all women extra punishment (birth pain)?
God didn't personally add that extra burden. He simply foresaw how the weaker sex would suffer outside the paradise. He allowed such suffering as punishment.
3C) If Adam and Eve didn't know evil, why blame them for being fooled?
Adam wasn't fooled. He deliberately disobeyed.
3D) Why would God insist that Jesus be murdered to cancel out sin?
To completely answer Satan's challenge that God's creatures are inherently self-serving and can't hold up under test.
3E) Jesus taught forgiveness; why couldn't God just forgive us?
Because as you noted, he is also a God of justice.
4A) Do you really believe lions were originally designed to eat grass?
No.
4B) If life is sacred, why is our immune system designed to kill germs?
Not all life has the same value. Peter, in referring to apostates, said that they were like unreasoning beasts that are caught up NATURALLY to be destroyed. So beast are born to die. Death is part of their natural cycle of life. Jesus also noted that human are worth more than many sparrows. That's because we were originally made in God's image. Jehovah lives forever and it is his will that all his children to so as well.
4C) Where did smallpox and leprosy come from? (Did God create them?)
Of course. If a human's immune system were perfect such tiny little microbes wouldn't faze them.
5A) Who besides the Society says the temple was destroyed in 607 BCE?
No one.
5B) Why do Witnesses say "Jehovah", when that pronunciation is wrong?
It is the Anglicized pronunciation and is far more accurate than Yahweh.
5C) The Bible is full of miracles; does it say why they stopped?
They haven't stopped. Perhaps just a temporary interruption.
/ You Know