When Catholics remarry before their first marriage has been declared null, they then marry outside the Catholic Church. Divorced Catholics who have remarried still have a place in the Catholic Church. They still need to pray to God and venerate Him with their brothers and sisters. But, because of their irregular state, they are not allowed to receive the Eucharist. In some cases however, a declaration of nullity might have been possible with proofs and witnesses.
Some pastors think so.
You can follow their responsible opinion without going against the doctrine of the Lord and the Church. Neither Christ's doctrine nor His mercy are to be sacrificed.