Father Rick Chunn likes to consider himself God's minister on wheels, rolling the Good Word onto the streets, across the ocean and to other offbeat places most clergymen refuse to tread.

Namely, Roman Catholic priests.

Pregnant and in love? Want to marry again despite a nasty divorce? Dreaming of a ceremony in some out-of-the-way place other than a church--say, in a park, on a boat or on top of a rock? Tired of those months-long premarital classes required by the Roman Catholic Church?

Well, then, Father Chunn is your man. He'll marry you, baptize you, confirm you, counsel you, bless you, offer your First Communion--even your last rites.

No questions asked.

Roman Catholic priests, however, are asking lots of questions. They say that Chunn is less priest than impostor. They don't like his ads that have run in both the telephone Yellow Pages and local newspapers: "Want a Catholic wedding, but turned down by the Roman Catholic Church? Call Father Rick Chunn."

But Chunn only smiles at their suspicions.

Trusty Thomas Bros. Guide in hand, he ventures from an El Segundo storefront church to administer his faith from Los Angeles to Palm Springs. Mostly, though, Chunn motors San Fernando Valley freeways, often on last-minute calls for a lost soul in need.

"God can bless anybody he wants," says the bespectacled 44-year-old priest. "Often, he doesn't wait around for everything to happen in a certain order as demanded by the Roman Catholic Church."

Chunn is one of two bishops of the little-known Celtic Catholic Church, a tiny denomination that claims just 300 followers and seven priests nationwide--five of them in Southern California.

Dressed in sober black attire and white collar, he looks like a man of the Roman Catholic Church, although he does not claim to be one. His demeanor is gentle, considered, priestly.

But Roman Catholic Church officials say Chunn is operating on a wing and a prayer--one of a host of religious wanna-bes preying on the public's lack of discrimination when it comes to a father-figure in a clerical uniform.

They say the ceremonies that Chunn performs aren't recognized by their church. Some even doubt the existence of Celtic Catholicism.

"I would defy anyone to find any reference to Celtic Catholicism in the Encyclopedia Britannica or any other major source," says Father Gregory Coiro, a spokesman for the Catholic Archdiocese in Los Angeles.