[Serious] For former Christians only, why did you leave your faith?

[Gwaithmir]

I debunked the Kalam Cosmological Argument as it had been interpreted by St. Thomas Aquinas.

Aquinas describes in detail why he rejects the Kalam argument.

Unfortunately, I cannot cite the textbook or author who described Aquinas' version of the Kalam Cosmological Argument, but it was discussed extensively by the priest who taught the religion class when I was a senior in Catholic high school and no mention was ever made of Aquinas' alleged rejection of it. Perhaps this was because the last thing our "educators" wanted was for Catholic students to research the issue on our own. We were in that class to be indoctrinated, not to learn how to think rationally about Catholic theology. What caused me to question Aquinas' ideas was the fact that astronomy was a hobby of mine and I had already constructed my own backyard observatory with a 3" refracting telescope.