Revelation 20.3 says during the 1000 years Satan is in the pit: "And cast him into the bottomless pit, and shut him up, and set a seal upon him, that he should deceive the nations no more, till the thousand years should be fulfilled: and after that he must be loosed a little season."

My question #1: How can Satan currently be the god of this world and ruler of this world if he is in the pit, totally sealed, for 1000 years?

"In whom the god of this world hath blinded the minds of them which believe not, lest the light of the glorious gospel of Christ, who is the image of God, should shine unto them" (2 Cor. 4:4).
"Wherein in time past ye walked according to the course of this world, according to the prince of the power of the air, the spirit that now worketh in the children of disobedience" (Eph. 2:2).
"Now is the judgment of this world; now will the ruler of this world be cast out" (John 12:31).
"We know that we are from God, and the whole world lies in the power of the evil one" (1 John 5:19).

My question #2: How can overcomer saints be reigning over the nations today with a rod of iron for 1000 years since today few Christians are in a position of power to do so? Many of us are being martyred.

"They lived and reigned with Christ a thousand years...they shall be priests of God and of Christ, and shall reign with him a thousand years." (Rev. 20.4,6).
"He that overcometh, and keepeth my works unto the end, to him will I give power over the nations: And he shall rule them with a rod of iron" (2.26,27).

When it says "they shall be" won't that be a future millennial kingdom? "I will give" is future. "He shall rule" is not happening now.