This is essentially the same teaching found in the Bible.
Jesus said, "Pay back Caesar's things to Caesar, but God's things to God." The question here, of course, is which are which. The principle does not itself say.
The apostles told the Sanhedrin, "We must obey God as ruler rather than men." the question here is what you believe God is telling you to do.
I believe this played out during the Roman era, during the persecutions, when Christians were often told that they could be spared if they said, "Caesar is a god." And if they refused, they would be killed in ugly ways. The Martyrs knew that their souls belonged to God and so they did not lie to the earthly authorities. They declared that Caesar was not a god, and were then killed in ugly ways.
Muslims, on the other hand, enjoy lying to the infidel, so that the infidel can later be killed in ugly ways.
Not hardly, the Bible says not to lie and the Koran says lying is ok if the situation warrants it. Situational Ethics is a foundation of Islam, but not present in the Bible.
Yes, but this isn't. "Hence, keeping this in mind if one is forced to sign the above in order to become a citizen or the only way of attaining citizenship is by acknowledging the above, then one may sign it with the intention that Shari’ah and Deen will always be his yardstick."
Sharia law is Mohammedan law and is not the same thing as natural law. My understanding is that, under Sharia law, Jews and Christians are treated as dhimmini (second class citizens whose freedom of worship is severely restricted) and members of other religions are treated even worse.
Correct. In other words, obey your government unless doing so will force you to sin. Nothing wrong with that (assuming that one has a decent idea of what sin is -- a more troubling question w/ regard to Islam).