Sorry boss, u are wrong, TN is fast becoming christianic - for proof go and see the no of churches mushrooming in chennai.
In chennai No of churches > No of Temples.
Since TN has long been a dravidian party ruled state- which encourages atheism only, the relevance to hindu gods have decreased. But these atheists dont bother abt christianity or islam. Percentage of Christianity os 10.9 % in TN. For proof please refer wikipedia. Where did they all come from?? All lured for chocolates(when they were young), jobs(when they are need of) and money!
The survival of Hinduism in Tamil Nadu depends on the stopping of Christian conversion.