Curtis Foley from All Nations Christian Fellowship in Hua Hin, south of the country, was speaking after the city, and others in Thailand, were under total lockdown with no one allowed in or out.
Tourists are being warned to "exercise extreme caution" in Thailand after the blasts which also injured dozens others.
Where the blasts happened:
THURSDAY
Trang, 3pm, kills one person and injures six at a market.
Hua Hin, 10.15pm and 11pm, kills one woman and injures 21 on a tourist street.
FRIDAY
Phuket, 7.45am, injures one person on Loma Beach.
Surat Thani, 8am, kills one person and injures three near a police station during an event celebrating the Thai queen's birthday.
Surat Thani, 8.30am, at a police station.
Phuket, 8.45am, near a police traffic control booth.
Hua Hin, 9am, kills one and injures three by Hua Hin clock tower.
Phang Nga, 9am, at a market.
Speaking on Premier Christian Radio Pastor Curtis Foley said: "People over here are angry. [It could be] an aim to try and hurt the tourism business so that it hurts the government.
"I've been in Thailand fifteen years. We've had a few [bombings] over the years, it hasn't been that many. The Thai people take it very well - they don't get upset about things very much.
"I just had a parishioner contact me and ask me whether we were cancelling the Sunday service and I said: 'no'.
"We want to continue to be a light in the world. When people do things like this, whether it's Isis or other politically motivated acts, we still need to stand for Christ."
An FCO spokesman said: "There have been multiple explosions in tourist areas across Thailand on 11th and 12th August.
"We are in close contact with local authorities and urgently seeking more information. We stand ready to provide assistance to any British nationals involved."
It is advising against "all but essential travel" to the provinces of Pattani, Yala, Narathiwat and Songkhla on the Thai-Malaysia border.
Listen to Premier's Aaron James speaking to Curtis Foley:
