The most powerful way to know is through living the Christian Way, day after day, week after week, year after year. You can feel him inside.
Science is more like a game--sometimes very frustrating--like solving a puzzle with pieces missing--leads to paradigm shifts--nothing is for sure--could be really really wrong. But can be improved and tested through experiment.
o, science is always wrong--but getting better; Spirituality is always true--but you must be sincere and persistent
Anyway, Tom, that's my way.