>>I believe that God's laws have to change, according to the requirements of the time. For instance, Jesus indicated, in a few places, that laws from the past were superceded by His own laws.
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>This is innacurate - Jesus did not change nor did he advocate changing the law. Jesus' teachings were in complete harmony with Jewish MORAL and CIVIL law. In fact, he stated, "Do not think that I have come to abolish the Law or the Prophets; I have not come to abolish them but to fulfill them" (Matthew 5:17). Ephesians 2:15 might seem to contradict, "...by abolishing in his flesh the law with its commandments and regulations..." but in proper context it refers to the CEREMONIAL law. That is, Jesus became the true sacrifice that actually reconciles the Christian to God, thus no further animal sacrifices would be necessary (because their purpose was only to symbolize and point to the true sacrifice which, before Jesus death, had not yet occurred). This is explained in greater detail in the book of Hebrews, summarized somewhat in Hebrews 10:3-4, "But those sacrifices are an annual reminder of sins, because it is impossible for the blood of bulls and goats to take away sins." So,
>Christians need not observe the ceremonial part of the law.

Whether you call it ceremonial or not, it is part of the law, right?

Now, the central part of the Teachings is unaltered, and perhaps that is what you mean. For instance, in the Old Testament it was not considered proper to kill people, and that part was maintained.

Other laws had to change according to the requirement of the times.

I find it quite logical that God reveals certain laws, and then changes them later, according to the changing needs of society.