The response I get most often from non-Christians is how they've picked and pieced together from all the different religions what they like and consider to be truth. I applaud all who seek, I always have faith they will find. This quote by Alexander McLaren addressed that --

There are people like the merchant in the parable

who went all over the world seeking goodly pearls,

who, with eager longing to possess light, truth, goodness, or rest,

search up and down and find it nowhere

because they are looking for it in a hundred different places.

They expect to find a little here and a little there,

and to piece it all together to make one all-sufficing restfulness.

Then, when they are most eager in their search—or when, perhaps,

it has all died down into despair and apathy—

the veil seems to be withdrawn, and they see Christ,

whom they have been seeking all the time,

and knew not that He was there beside them.

All, and more than all, what they sought in the many pearls

is stored for them in the one "Pearl of great price."

The ancient covenant stands firm today as ever:

“Seek and you will find, knock and it shall be opened unto you.”