what percent of religious belief is based on the old testament, globally?

what percentage of world religions are abrahamic (based on the old testament)?

http://en.wikipedia.org/wiki/Major_religious_groups#Largest_religions_or_belief_systems_by_number_of_adherents

low: 38%
2200+1650+187.9+0.7=4038.6
2200+1650+187.9+0.7+1000+1500+3000+1000+65+29+12+3+3+2+1+1+0.8+0.63=10656.03
4038.6/10656.03=0.378996681

high: 61%
2,000+1,570+828+400+600+400+27+24+14+8+7.6+1+3+2+1+1+0.8+0.7+0.63=5888.73
2,000+1,570+14+7.6+0.7=5888.73=3592.3
3592.3/5888.73=0.610029667