Is Catholicism Christianity?

If one trusts in Mary, indulgences, the Mass, the Eucharist, the Magisterium, the Church Canon, to supplement the sufficiency of Jesus to save by faith, alone…you are NOT a Christian.

It is ONLY by faith in Jesus as Lord believing that He died to pay your sin-debt that one enters into covenant relationship with the Father and receives the indwelling Holy Spirit as Guarantor of that relationship (John 3:16-18; Ephesians 1:13-14).