Spiritually speaking, Am I bad for not fasting today?
No. While some are keeping Yom Kippur today as a traditional fast day there is not actually a commandment to fast today. It says to afflict yourselves, humble yourselves, etc.. but we are not commanded to fast. I will most likely BE fasting for Yom Kippur but it certainly does not make you "bad" for not doing so. Look into the meaning of the day and see what the scriptures say to you, then follow that.
Is occassional fasting, maybe only once or twice a year, good or bad for you? I mean is it unhealthy to fast?
Are you talking about fasting or about a detox??? What the people ^above me^ are talking about sounds very much like a detox - eating only fruits and veg, drinking plenty of water, drinking natural fruit juices, etc... This is not a fast or fasting. If you fast, you do not eat (unless it is for religious purposes and then you eat at certain times of the day, etc). It is NOT good to fast. Your body needs vital nutrients to keep it going and it needs to get them from whole foods that contain protein, carbohydrates and fats. By not eating, you are forcing your body to use the most readily available form of fuel for energy - that is your muscle tissue. Muscles are made up of proteins/amino acids are very easy to break down into fuel by the body. The simple answer is: Not eating = muscle wastage. Go on a fast if you really need to, but it is really not good for your body.
Why is Hinduism the right religion?
Get some education. You may be an atheist , thats your choice. You have no right to tell others what to believe and what not to believe. You are still acting like a missionary in behaviour- trying to shove down your beliefs on others. # Pakistan was not originated by hindus waring against Muslims. Muslims demanded a separate country on the mythical grounds that majority Hindus will take revenge for 1000 years of Islamic atrocities, once they got freedom. Still if You sudty statistics even given by Muslim humanitarians in Pakistan you will find at the time of partition and after that its Hindus who are victims. And Mr ignorant, Pakistan got its freedom on 14 August while India on 15 August after midnight. So it was not war that created pakistan. If Hindus were not tolerant after the atrocities of Muslims in Noakhali and other areas , India would not have had Second largest Muslim population in the world. Rockstar below is competing with you in stupidness originated from false knowledge.