Finding a little boy who mostly plays with little girls. and their toys, is a very good start. So is finding a little boy who is especially sensitive to the feelings of others or timid about things others boys run for. It's really not that hard to make a decent bet. If you have a little boy who doesn't make you nuts trying to jump off the roof, that's a good start. The girls are harder of course, females always are, but you start with the tomboys and see where it goes. People who work with gay teens have no problems spotting the younger ones at all. We are sexual creatures. even at very young ages.
These folks have done some more empirical work:
Is Your Child Gay - Scientific American
Millions of young boys play with dolls and millions of young girls play rough and tumble. You are foisting your own extremely rigid view of gender roles upon innocent children and then "deciding this means they are gay". "Gay" implies sexuality. If nobody put a seed in their head "if you play with dolls you're a gay boy", that boy would never even consider having sex with another boy's anus.
Your cult has done more to amplify gender-role disparity than any other movement I know of. In the old days prarie women were tough as nails, butchering hogs and helping buck hay. Were they all lesbians? In the old days men sang in church choirs and did elegant formal dancing on a regular basis. Does that mean they are all fags?
You folks need help. You are the problem, not the little kids who just want to be little kids.