“With 100%, respect: yes. It is wrong to take Communion in a Catholic Church without formally enrolling in the Catholic Church. You have two options: easy and difficult. Easy: claim ignorance and get a pass. Difficult: claim responsibility and then talk to a priest, fast for two years, talk to the priest again, and hope for mercy on your account.”
Or don’t worry about it.
Rome says the host is REALLY Christ's flesh.
However; in the favorite book of Catholics; Christ Himself said:
The Spirit gives life; the flesh counts for nothing. The words I have spoken to you-they are full of the Spirit and life.John 6:63