Your definition of religion makes everyone's beliefs become a religion. Perhaps you may want to redefine your definition a bit. Christianity is not a faith based upon rituals and rules per normal concepts of religion; but, it is a personal relationship with God. That is why it is not a religion per the usual language. We don't have lists of dos and don'ts to follow. We follow by spirit and not rules per se. I hope that you understand. It is the personal relationship that separates us from the normative religious perspective. Our faith is not directly related to cultural and social norms where there are stringent rules to follow.
I'm not sure I follow this line of thinking. Aren't there rituals and rules involved in Christianity? The ten commandments, the golden rule, the greatest commandment (love the lord + one another) are all a set of rules to live by. And there are a number of rituals such as baptism, communion, religious attendance on sunday, etc. Those seem to be rituals and rules to me. Obviously a relationship with god seems to be the central aspect, by saying you don't live by rules seems quite strange. Of course you do, and the bible details quite a few of them.
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