Religion involves God. Buddhism is a set of ideals/principles that lacks any ties to a god, and thus is not a religion.
Whether you believe it is a religion or not is your choice, no use in us arguing.
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Religion does not inherently involve a god or gods. Often it does, but not always. In every source I listed there is a definition of religion that Buddhism falls under. Buddhism is more than a code of ethical conduct, it's a view on the supernatural structure of the universe.