Well there are a lot of differences. Firstly a Muslim is a person who follow Islam and Vishnu is a God not a religion. So your question is actually difference between Islam, Buddhism, Jainism, and Hinduism.
Among these Islam is the most different one. Islam talks about one God and his many messengers.
Buddhism, Jainism are separate from Hinduism but actually originated from it. They share a lot of the same ideologies but unlike Hinduism; Buddhism and Jainism doesn't really talk about a God. They say that God exists but doesn't know what is his form. Gautam Buddha and Mahavir were just teachers and not God.
Hindus believe in multiple Gods, a trinity and so on.
Basically all were same. Taught by different prophets before Prophet Muhammad in isolated societies. And all were only Islam in original form. But later people adulterated the Original teachings and became invalid
So The Prophet Muhammad was sent fort entire human beings until dooms day with a Book of god as guidance to all men called Qur-an and the followers are now known as Muslims and this true religion now is known as Islam.
It's interesting to read what people say about their Near Death Experience :
1. God doesn't care which religion is best. God does not care what religion people practice. They are all a blooming facet of the whole. All religions refer to the same God. (Mellen-Thomas Benedict)--The different religions just have different ways of explaining the same Creator. (Dr. Liz Dale)
2. Doctrine and creed and race mean nothing. No matter what we believe we were all children joined under one God. The only rule is God's true law: Do unto others as you would have them do unto you. (May Eulitt).
3. One man who had a near-death experience realized that the "God" of his religious background wasn't anything like the reality. He learned that it doesn't matter if people call him God, Allah, Great Spirit or whatever, he is one and the same. (Dr. Liz Dale)
4. Religious beliefs have little to do with what we experience in the transition from one realm to another, except that we are allowed to see briefly the teacher or guru that we followed. Regardless of cultural or religious beliefs, we have the same basic experience at death. (Betty Bethards)
5. God cares little about our religious affiliation or church membership. Love is not limited to any one religion or even religion at all. Religions are cultural institutions but love is universal. (Kevin Williams)
6. Your religion is where your love is. (Henry David Thoreau)- Near-death accounts suggest that unconditional love is the highest form of religion there is. (Kevin Williams)
7. How are we saved? By unselfish love. When we love unselfishly, our vibrations are so high that the only place we'll fit into is heaven. There is no other place we can go if we want to. This is divine justice because it gives all the people who ever lived, as well as all the higher animals who know right from wrong, an equal chance to eventually attain internal harmony which will fit them into some kind of heaven - regardless of their intelligence, education, indoctrination, ignorance, wealth or poverty.(Arthur Yensen)
8.There is light that can be found in many, many other faiths. All faiths which stress love have this focus. All have their own paradise, but the devoted eventually learn the tremendous experience that all is one under God and that there is no division in purpose.There is one God of us all. (Margaret Tweddell)
9. The answer came to me with the purest of understanding. Each of us, I was told, is at a different level of spiritual development and understanding. Each person is therefore prepared for a different level of spiritual knowledge. Each church fulfills spiritual needs that perhaps others cannot fill. No one church can fulfill every body's needs at every level. (Betty Eadie)
10. Religions have a place and any one person in that religion is on the path of learning what is important for that soul. (Darlene Holman)
11. The most important thing is to really live what our religion teaches. Even if we have the greatest religion of all, it won't do us any good if we don't put it into practice in our lives. Whatever we practice becomes a part of us. (Daniel Rosenblit)
12. Religion is used as a stepping stone to further knowledge. As an individual raises his level of understanding about God and his own eternal progress, he might feel discontented with the teachings of his present church and seek a different philosophy or religion to fill that void. When this occurs he has reached another level of understanding and will long for further truth and knowledge, and for another opportunity to grow. And at every step of the way, these new opportunities to learn will be given. (Betty Eadie).
13. We have no right to criticize any church or religion in any way. They are all precious in God's sight. Very special people with important missions have been placed in all religions that they might touch others. (Betty Eadie)