yes, John
and it doesn't have to be 100
I do think there is power in agreement with others in prayer...I don't have the theological background to reference why
but for someone who has doubts about scriptural validity, references may not mean much
I can tell you this, once I learned to trust others who believed more with my needs and the needs of others for prayer, the more I did it the greater the result. And all most all the time, the prayer was answered with a Yes...always more than I would have thought possible if I had no faith and believed only in human logic. The only time I can think of in the last 7 years when I didn't get what I thought was best, it SAVED us and kept us safe to get a No. He knew what I didn't...and it was made horribly clear later, but in the nick of time. I do believe that the prayers of others for us kept us safe all along, when I was tempted to think he wasn't coming through...
John, it's a personal, internal process more than something anyone or scripture can tell you. Later, scripture confirmed what I experienced and what I came to understand internally. I suspended belief for a long, long time in what I was told. I would still say, pray and ask God to show you.