But he has not performed the sacrament of marriage according to the Catholic faith, since he was not married in a Catholic church, and/or if a priest did not assist in the ceremony. Your husband could attend Catholic mass, confession and receive the Eucharist if he wished to do so. And a priest could explain your marital status better than I.
I too married a Catholic man in a Methodist church, 35 years ago. This did not affect his ability to attend mass, take communion, attend confession, etc etc etc. Your marriage is not “invalid”- it is just not recognized as having been performed according to the requirements of the Catholic sacrament of matrimony.
Now that I am considering conversion, a priest asked if we wish to be “married” again - in a Catholic ceremony - so he/we can participate in this sacrament.
What you’re saying is not actually correct. The marriage of a Catholic in a non-Catholic setting IS invalid unless it was done with the bishop’s dispensation. It is called a “defect of form.” Until such a marriage can be convalidated (retroactively “blessed”), the Catholic should not be receiving the Sacraments. Of course, with catechesis in this and other matters being so deficient lately, many, many catholics in this position don’t even know what they should be doing here. You might want to see my posts 61 and 62 for more detail.