Too many things to answer, but I will try inlined.
i don't know why you do(or believe) these things, i would like to know how do you feel doing these works, and if you feel nearer to god working like this.
#purgatory
Biblical reference, plus the purification of the soul is a common theme, not only eternal damnation.
For example, look at the conversation between the Holy Mary and Jesus at the wedding before His first miracle. Also, revelations with woman + crown in sky.
#transubstantiation (the conversion of the substance of the Eucharistic elements into the body and blood of Christ at consecration, only the appearances of bread and wine still remaining)
Simply a fact of history, and as usual rejected by protestants, for eartly agenda, but God provides that fact.
#mary and the saints as mediators between god and me.
You can't entitle yourself to just whatever. This includes Jesus. You can't reject those who help you.
Your child needs protection. You deny his protection by not babtizing him. Even Moses has a first-born-consecration law.
If you don't repent, you can't atone. Basic logic of the Gospels.
#pope vicar of christ, infallibility of the pope
Popes have responsibility, the office is established by God.
#sacraments:
>initiation
baptism
confirmation
eucharit
restored order of initiation
>sacraments of healing
penance and reconciliation
anointing of the sick
>sacraments of service
holy orders
matrimony
Direct traditions of the early churches. The catholic church is the apostolic church, carries the ancient and true practices uninterrupted from the day of Christ's first coming.
Facts of life. It hurts people that those who are not attacked, attack the Church for helping those who are attacked.
If you reject pieces of the Lord, it still remains true, only you reject them. Mathematical set theory. Apocryphies are real, only ignored by Protestants. Like negative roots of a quadratic equation.
The Cross is venerable, and the Cross protects, the Cross was the only thing that is worthy to hold the Lord.