Augustine is quoted as saying of God "our hearts are resltess until they rest in Thee." I believe that is true. Every person is created by God and searches for ultimate meaning in their lives. This is basically a good thing because ultimate meaning can only find its fulfillment in the Ultimate Truth - God.
As a Christian, and as an ordained deacon Christ's one, holy, catholic, and apostolic Church; I find ultimate truth to be the Holy and Undivided Trinity - Father, Son, and Holy Spirit. I know this Trinity because of God's self-revelation through Holy Scripture and because of the Second Person of the Trnity's incarnation in Jesus Christ - who described himself as "the way, the truth, and the life." (John 14:6)
Also, in my academic training, I have concentrations in science and math with a degree in Information Systems. In mathematics, I was trained to "prove" postulates and theorems. I was also trained in logical thinking and algorithm development (an algorithm is a step by step process to solve a problem in a finite number of unambiguous steps).
One of the reasons given for offering blessings of same sex unions (and ordaining men or women involved in same sex unions) is that science has "proven" that sexual orientation (at least for men) is not something that is chosen by the person. It is something that is, often, determined prior to birth. Now, I don't know that science has conclusively proven that sexual orientation is something determined prior to birth or shortly there after or if sexual orientation is deterministic at all. However, let's assume it is for the sake of argument.
The argument runs thus: Since people do not seem to have a choice in their sexual orientation, it must follow that they are created this way by God and, since God does not create sin, sexual orientation must not be sinful. Since the orientation is not sinful, then the physical expression of that orientation (within perscribed limits such as mutual monogamy and life long) must not be sinful. Since heterosexual expression is not sinful within marriage, homosexual expression must not be sinful within its marriage analog (or within marriage).
There are at least two problems with that statement. First is the definition of marriage, but that is another post. The second, and the one I want to tackle here, is that the reappraisers confuse "fact" with "truth." Facts are things that are. Human beings have two ears and one mouth. That is a fact. The Truth, on the other hand, describes the meaning behind the facts. We were designed to listen twice as much as we speak. That is a truth statement.
The problem here is that science and religion ask and answer very different questions. Science asks "what" and "how." Religion asks "who" and "why." When it comes to sexual orientation, science can speak to what and it is beginning to explain the how of orientation. But it still cannot proclaim the expression of that sexual orientation to be "good" or even morally neutral. That is the job for faith and religion.
Too many of our clergy and leaders in TEC today have made the enlightenment error of confusing "fact" and "truth." They seem to believe that because something "is" it is "good." They forget that all of creation is fallen and almost all of the things that are, are twisted out of their original design - sexuality included.
So, how do we know the "truth" rather than just the facts? The truth is known through the One who is the Truth - Jesus Christ. We look at God's self revelation in Holy Scripture and in Holy Tradition and we look at the reasoning of the whole Church on an issue. On this issue, Scripture, Tradtion, and reason are all in agreement that sexual expression is to be limited to the insitution of marriage - which is one man and one woman for life.