Romans 14:1-2 — Him that is weak in the faith receive ye, but not to doubtful disputations.
For one believeth that he may eat all things: another, who is weak, eateth herbs.
in the faith — should be "in faith." Not referring to Christianity (the faith) but to reliance.
weak — lacking in understanding of Christian liberty with faith in Christ alone — having scruples about unimportant matters — not moral weakness
not to doubtful disputations — unreservedly and not for the purpose of judging or criticizing
receive = embrace