The secular humanist tends to have a double standard. On the one hand, they try to define moral truth as relative, subjective to each one’s own experience. But on the other hand they try to define material truth as absolute, and attempt to do so by the tools of science.
If something is true, then it is true all the time. Otherwise it could not be called truth. Here I would like to use a scientific model to show the logic of absolute moral truth. I would like to use a mathematical illustration.
In mathematics, problems are solved using formulae. These could be simple (for example the Pythagorean theorem – a^2+b^2=c^2), or more complicated (say, the quadratic formula, which I do not have the ability to type in this space). Each of the numbers plugged into the formula are called factors (for example, a=2). And each formula, when the factors are plugged in and the math is done correctly, will produce a correct answer.
Now a couple things must be noted when it comes to math problems. First, if you use the wrong formula (for example, if you try to use the quadratic formula to get the length of the long side of a right triangle), you will get the wrong answer. And further than that, chances are your answer will not even be close. Second, if you use the wrong factors you likewise will come to a wrong answer. Third, if you have the right formula and right factors but miscalculate and do the math wrong, you will also get the wrong answer. Fourth, all formulae have mathematical proofs to show that they are in fact the right formula to get to the answer you are trying to reach. So you can be sure you are using the right formula to reach the answer.
This model can be used to illustrate the solving of a moral problem. Firstly, we notice that a problem exists and needs to be solved. Secondly, if there is a problem to be solved there is also a formula to solve it. Third, there are certain factors that must be inserted into the formula that will add up to the answer. And fourthly, when this is done, we will come to the right answer.
Clearly finding a right moral answer is a highly scientific process, if only more abstract and philosophical that the science of mathematics.