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The Pope is the "vicar" of Christ ( The word "vicar" means one who serves as a substitute, and is derived from the word "vicarious.")

The Priest is another Christ, and a mediator between God and men

1Ti 2:5 For [there is] one God, and one mediator between God and men, the man Christ Jesus;

It seems like they have many Christ's as was prophesied :

Mat 24:23 Then if any man shall say unto you, Lo, here [is] Christ, or there; believe [it] not.
Mat 24:24 For there shall arise false Christs, and false prophets, and shall shew great signs and wonders; insomuch that, if [it were] possible, they shall deceive the very elect.
Mat 24:25 Behold, I have told you before.
Mat 24:26 Wherefore if they shall say unto you, Behold, he is in the desert; go not forth: behold, [he is] in the secret chambers; believe [it] not.

And of course Mary and the Saints are also mediators between Christ and men.

Is no Catholic able to approach the throne of God for Himself?

Hbr 4:16 Let us therefore come boldly unto the throne of grace, that we may obtain mercy, and find grace to help in time of need.

It seems like they have many Christ's as was prophesied:
Mat 24:23 Then if any man shall say unto you, Lo, here [is] Christ, or there; believe [it] not.
Mat 24:24 For there shall arise false Christs, and false prophets, and shall shew great signs and wonders; insomuch that, if [it were] possible, they shall deceive the very elect.

Amen.