I don't know what you mean by their opposition to Catholicism, which I don't think was ever present as they were opposed to the abuses and exceptions of the clergy.

Generally, the peasantry would be mixed to the Revolution, some were interested in the equality that was to be gained, others were appalled at the rejection of the traditional order, and others would just not care. The best indication that there was mixed support would best be seen in the Vendee.

The Vendee was a Civil War within the Revolution located in Southwest France which was a very bloody and terrible part of France that experienced social upheaval in resistance to the Revolution. From the proclamation of the Republic to the creation of the Consulate, the Vendee would see needless murder and wanton destruction in the name of Royalists and Republicans.

I wish I could provide numbers but I haven't seen anything that deals in the numbers of support as well as how many died in the Vendee. At the time, it was an ulcer on the French military, draining thousands of men from the front in an effort to "pacify" the region. It's one of the more terrible sections of the Revolution that doesn't get discussed enough.