Of course, it depends on what you mean by "religion". If you mean theology, then - of course not...
For example, Muslims believe God has no Son. Christianity hinges on Jesus Christ - God's Son.
Religion is "man's attempt to satisfy his notion of God". In this sense, all religion is works righteousness - "what can I do?"
In this sense, Biblical Christianity is not a religion. It is all grace (receiving an undeserved good).