If theology doesn't matter to you, please quit your job. Having theological integrity goes hand in hand with being morally responsible, as Christians derive morality from scripture. There are moral absolutes and your job is to prepare kids for a lifetime of people telling them there arent. The years of junior and senior high school are incredibly important for a developing worldview. Your job is not to convert them, but to try and live out the life of Christ and hope that He brings them to himself in time.
You can also love people despite opposing a sinful lifestyle, regardless of if its open homosexuality or anything else. I was part of a GSA in high school, and had mutually beneficial dialogue. Even though I disagreed with their lifestyle choice, I still accepted them as people. At the end of the day, it is their responsibility and I did what I could.
Please dont impose your own feelings on scripture, but let scripture inform your morality. Christ was the most loving of all men, but he also made no concession for sin.

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Sorry, you quoted the article that you linked so I assumed you were the author. I am very passionate about Christian leadership that is in error. Clearly not much of what I said really applies to you. Sorry for the misunderstanding.
I agree that there is a huge problem with Christians unable to love people "in sin." Parents that cut off ties with children because of lifestyle is horrific. Jesus is very likely ashamed of a lot of Christian action.
That being said, understanding that spiritual death is worse than physical death is important to grasp the Christian perspective. There is no difference between a life lived apart from Christ for 90 years or for 10 years, since both are spiritually dead for eternity. Many Christians use a corrupted view of this to alienate the living, instead of sharing the love of Christ in hopes that they will be changed by God.