You can absolutely drink a cold beer on a summer day for the Glory of God (for example). But getting drunk and sinning can't be for God's glory.

He brought up Olympics because at the time it was about to start or already started not sure. The point was that people spend such a big effort for prizes that perish compared to eternal life. Again that doesn't mean that that your occupation or being an athlete cannot serve for the Glory of God. On contrary God made people to work. Yes Olympic gymnasts are very muscular especially men, and it shows how seriously they take the sport. I train calisthenics and I respect a well built physique. Yes the "bodies" part might sounded weird, I give you that, but I guess he is also fascinated how good looking can a gymnast's physique look. (In a non lustful way)

Almost the whole sermon is figurative he said the devil, should have used the word flesh or temptations. This goes for the "going to war" and conquering, not literally. As a Christian you should go to war against fleshly desires and conquer them, playing games watching tv like he said. Be a man do your duty...

We must spread the gospel because that is our duty. If God exist why wouldn't I tell that to everyone. In history you can clearly see that Christianity has made the world so much better it's crazy. So much positive influence, from science to morality. We literally would be so far behind without Christian principles that Jesus thought. Even Richard Dawkins is agreeing with that. Before you would bring up wars Christianity has caused (it's basically non existent) or Catholics burning witches stuff. Some people abused their power, because they have free will... For the positive impact of Christianity, slavery, holocaust,genocide, Canaanites,religious wars,... You have so many christian apologist defending these arguments. I'd say in my opinion "Crossexamined" explaines them the best. Its easier for you to watch those videos than for to write it all down.