Hinduism is very old and existed much before Rama and Krishna. Vedas are said to be basis of Hinduism. We do not know who authored these. so, it is notpossible to name founder of Hinduism.
Prophet Mohammad is the founder of Islam and Quoran is the holy book
Jesus Christ founded Christianity.
Guru Nanak founded Sikhism.
Gautam Buddha was founder of Buddhism
However, above named prophets did not found any religion as such. They gave holy message and taught humans way of living. The followers organized themselves asorganized religious community. All religions guide for better living. It cannot besaid that oldest religion is necessarily best. .
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I can tell you about christianity and suggest to read bible at least twice or trice to get some information as well you will feel better and good too I hope you will try an give me a proper reply as the god is suppose to come back so pls be ready for him for information pls read bible and this would give you a proper reply as well information