For the rest, start here:
If Catholics don’t need their relationship with God mediated by another institution, why the need for a pope? Or confession to a priest? How would a priest be able to tell you exactly what to do in order to be right with God? Why would you actually need to go to a church building to receive the body and blood of Christ — wafers and wine blessed by an agent of the church? Seems like an awful lot of reliance on a human institution to mediate the spiritual relationship.
If I am ignorant, please set me straight. I’m happy to learn, but am unmoved by simple assertions, without evidence, that I’m ignorant.
For the rest, start here:
There is, of course, no need whatsoever to go to a church building to receive communion. My own parish, when it was first established, had Mass in a community building in our development. The Pope frequently has Mass in large stadiums or out of doors, and this is frequently done in the Church. Holy communion is often received outside of Mass, in Hospitals and nursing homes, and even at the believer's homes, in certain cases, usually of illness.