I"m not a fan of your assumption that all fat people are gluttons. Some have medical conditions others suffer from mental illness.
That being said, yes gluttony is a sin, it's a prevalent one in our society and it absolutely could damn someone to hell.
I agree people focus way too much on the sin of homosexual sex. Here is something I said and continue to say on facebook in homosexuality is a sin/sex is a sin threads:
I've been on facebook about two years. I've lost count of the homosexual and abortion threads. There's a lot of sins listed in the bible. Here's a list of some and the number of posts I've seen on them:
You get the idea. Why then the focus on these two issues? I propose the following reasons:
1. They are 'hotter' topics and therefore create more discussion (sometimes with a positive reason for doing so, sometimes merely to stir the pot)
2. The vast majority of the population is not guilty of either one (assuming of course one believes both are sins)
3. The vast majority of the population is guilty of the others I listed.
It's so much easier to point a finger rather than examine ourselves. A few people in the forums essentially admit that, and God bless them for it. To the rest I direct you to our Lord Christ Jesus:
"If any one of you is without sin, let him be the first to throw a stone at her."
- John 8:7
"For in the same way you judge others, you will be judged, and with the measure you use, it will be measured to you. Why do you look at the speck of sawdust in your brother's eye and pay no attention to the plank in your own eye? How can you say to your brother, 'Let me take the speck out of your eye,' when all the time there is a plank in your own eye?" - Matthew 7:2-4
and in Peter:
"Above all, love each other deeply, because love covers over a multitude of sins." - 1 Peter 4:8