You're incorrect there. The purpose of being created, by God, is to worship the very same single God without attaching any partner or child to God. We have been provided guidance and the best way to interact with one another to ensure the continuation of a society without corruption, lies, alcoholism, murder, theft and injustice.
This is not a matter that had existed 1400 years ago. This is a matter which had existed prior to the first ever human being on this planet and the message has always been the same - To worship a single God who has provided us with a completely perfect and flawless way of living.
If you're religious or non religious, your way of living and your morals and your code of conduct will always be based on something. You will always either be a slave to a flawed society and your own desires, or you can choose to take your moral and societal conduct from a matter that has already been decreed.
You shouldn't paint every religious person with your flawed brush of Christianity.