Sir Alexander Fleming, when he discovered penicillin, warned against people taking too little of it. An under-dose, he said would permit germs to remain in the system thereby allowing one to build up an immunity that could then be passed on to other people. So, by playing with penicillin treatments people could do serious harm to themselves and others.
Something similar happens in the spiritual realm when people play with faith and dabble in a spirituality that really doesn’t demand anything of them. It’s good to have an interest in the deeper mysteries of life, but if that interest doesn’t reach down to the very heart of our being and change us, it won’t be the sort of faith that truly makes the connection with God and sustains us through life. It may be just enough to make us immune to the real thing.