What is the basis for your belief his commutation of death penalties is based in the RC dogma?

Here's Biden's statements:

SNIP Make no mistake: I condemn these murderers, grieve for the victims of their despicable acts, and ache for all the families who have suffered unimaginable and irreparable loss.

But guided by my conscience and my experience as a public defender, chairman of the Senate Judiciary Committee, Vice President, and now President, I am more convinced than ever that we must stop the use of the death penalty at the federal level. In good conscience, I cannot stand back and let a new administration resume executions that I halted. SNIP

And this is a case that resonates with many people, including me, where it is highly likely that we executed an innocent man:

SNIP Cameron Todd Willingham was executed in Texas in 2004 for allegedly setting a fire that killed his three young daughters 13 years earlier. He always claimed his innocence, and the arson investigation used to convict him was questioned by leading experts before Willingham was executed. Since 2004, further evidence in the case has led to the inescapable conclusion that Willingham did not set the fire for which he was executed.The Texas Forensic Science Commission issued its report on the convictions of Cameron Todd Willingham and Ernest Willis on April 15, 2011 recommending more education and training for fire investigators and implementing procedures to review old cases (the commission issued an addendum to the report on October 28, 2011). SNIP

innocenceproject.org - Cameron todd willingham wrongfully convicted and executed in texas

Now that was a Texas state case, and Biden is talking Federal law, and federal cases are generally handled better than state cases, but we can get it wrong. I don't see anything that speaks to Biden's faith being the determiner in these actions.

Also:

SNIP In almost half of the cases that the Innocence Project takes on, the clients' guilt is reconfirmed by DNA testing. Of all the cases taken on by the Innocence Project so far, about 43% of clients were proven innocent, 42% were confirmed guilty, and evidence was inconclusive and not probative in 15% of cases SNIP

Knightof3 says this:
Even people that the Innocence Project gets off the death row are often free because of some point of law, not because they didn't do the crime.

Knight, these people were exonerated -

Black's Law
Exonerate
Definition and Citations:

To lift, remove the stain of being called out for blame, liability, or punishment. It is more that just freeing an accused person of the responsibility for a criminal or otherwise illegal or wrongful act. It is publicly stating that this accused should never have been accused in the first place. Refer to acquit and exculpate.

So, no, they weren't freed because of some point of law, and it was publicly declared by an agent of the state that they didn't do the crime.

That is all though.