Calvinists believe sickness is a sign of gods displeasure with you for some sin
Sickness is not considered as sin in any religion.
have to
Any religion that follows the teachings of Jesus and believes that he saves humanity from the "wages of sin".
No, There is no religion who believes God is time.
It is a polytheistic religion. If a religion believes in one God, they are monotheistic. (Christianity, Islam, Judaism are monotheistic)
Sometimes sickness is a punishment for sin (Psalms 38:4). Sometimes sickness is simply because of our own carelessness or foolishness (Proverbs 22:5 as interpreted in Talmud, Ketubot 30a). Sometimes sickness is a specific message from God. Sometimes sickness is a message from our body, that something needs repair. Sometimes sickness is to purify the soul.
Only if your culture believes it to be so.
Buddhism believes in the 4 truths
The religion called Shakers.
It is not a sin to convert to Christianity.
Judaism
None.