Don't eat pork, don't eat seafood unless it doesn't have scales, wear a headscarf, don't eat meat on Friday, go to church, go to mosque, go to synagogue, get down on your hands and knees 5 times a day, Christen your baby, remove your son's foreskin, slaughter your animals like this, don't take dairy with other foodstuffs, wear orange, wear this hat, wear that hat, don't ever drink alcohol, drink this wine because it represents the blood of Christ, don't have sex before marriage, don't use contraception, don't divorce, don't drive on Saturday, shave your head, don't eat cows, eat cows but just make sure you kill them the right way, don't eat during daylight hours, the more money you make the further removed you are from God, the richer you are the more you honour your Creator.
There are so many different brands of religion, with so many different rules and regulations it makes the European Union look like a streamlined organisation.
Let people believe what they want to believe. Just make sure that their individual beliefs remain that, and institutions and organisations aren't forced to change in order to cater for them.
If you think God doesn't want you to eat or drink during the Olympics, then don't. If you think God doesn't want you to run on Saturday, or Sunday, then don't. If you think God doesn't want you to run the marathon unless you're covered head-to-toe in cloth, then cover up.
Just as long as you don't expect the Olympic Games to cater to your personal belief system, there's no problem.