Why haven't any of these 8 states been hit with a massive law suit?

In these states, one is not allowed to hold a government office unless you acknowledge a belief in God and heaven.
Atheists not allowed.

Arkansas:
Article 19, Section 1
“No person who denies the being of a God shall hold any office in the civil departments of this State, nor be competent to testify as a witness in any Court.”[90]

Maryland:
Article 37
“That no religious test ought ever to be required as a qualification for any office of profit or trust in this State, other than a declaration of belief in the existence of God; nor shall the Legislature prescribe any other oath of office than the oath prescribed by this Constitution.”[91]

Mississippi:
Article 14, Section 265
“No person who denies the existence of a Supreme Being shall hold any office in this state.”[92]

North Carolina:
Article 6, Section 8
“The following persons shall be disqualified for office: First, any person who shall deny the being of Almighty God.”[93]

South Carolina:
Article 17, Section 4
“No person who denies the existence of a Supreme Being shall hold any office under this Constitution.”[94]

Tennessee:
Article 9, Section 2
“No person who denies the being of God, or a future state of rewards and punishments, shall hold any office in the civil department of this state.”[95]

Texas:
Article 1, Section 4
“No religious test shall ever be required as a qualification to any office, or public trust, in this State; nor shall any one be excluded from holding office on account of his religious sentiments, provided he acknowledge the existence of a Supreme Being.”[96]

An eighth state constitution affords special protection to theists.

Pennsylvania:
Article 1, Section 4
“No person who acknowledges the being of a God and a future state of rewards and punishments shall, on account of his religious sentiments, be disqualified to hold any office or place of trust or profit under this Commonwealth.”[97]

http://en.wikipedia.org/wiki/Discrimination_against_atheists