Having been a Catholic for many, many years, let me throw my opinion out. In Catholic doctrine, the bread and wine actually become the real body and blood of Jesus. In other words, the priest brings God's real presence down on the altar. Now. The problem is that no one really senses this presence. Everyone continues sensing bread and wine and there really is no "presence".
To illustrate this point, watch a three year old child in a Catholic Church. Do they detect any change? No. Parents are, continually, trying to get their children to be attentive to the priest when he "consecrates" the bread and wine and "changes" them into the body and blood. One would think if the all powerful God was physically in your presence, you would sense some kind of presence.
Since one does not notice any momentous event, the church has surrounded this happening with all kinds of visual and sensual props in order that the "faithful" might feel something "sacred". Incense, elaborate priestly vestments, kneeling, chant, bells ringing, all these things are utilized in order for the "faithful" to think something momentous has taken place. It is, indeed, mind manipulation. It is intended to make ones mind perceive something that it does not sense. To illustrate how important these gimmicks are, consider the following.
In the 1960's, Vatican Council II ushered in many changes to Catholic worship. The Mass was simplified and much of the gimmickry was eliminated. As a result, many lost their faith; nuns left by the thousands and so did priests. The faithful that remained turned to other gimmicks such as emotional hymn singing; holding of hands and lifting hands into the air (it's no coincidence that the charismatic, pentecostal movement entered the Catholic Church after the 60's changes), etc. As a result, thechurch is in the process of returning to the old rituals and gimmicks.
It happens in all religions to a greater or lesser extent. Why does a Pentecostal church get the spirit only after the preacher and choir warms them up with emotional song, dance, and shouting sermons?