At the risk of running dangerously off topic:
You have a duty to honor your father and not disrespect him on his beliefs, but if ever the opportunity for peaceable discussion on the topic should present itself:
Matthew 15
10After Jesus called the crowd to Him, He said to them, "Hear and understand. 11"It is not what enters into the mouth that defiles the man, but what proceeds out of the mouth, this defiles the man."
12Then the disciples came and said to Him, "Do You know that the Pharisees were offended when they heard this statement?"
13But He answered and said, "Every plant which My heavenly Father did not plant shall be uprooted.
14"Let them alone; they are blind guides of the blind And if a blind man guides a blind man, both will fall into a pit."
The Heart of Man
15Peter said to Him, "Explain the parable to us." 16Jesus said, "Are you still lacking in understanding also?
17"Do you not understand that everything that goes into the mouth passes into the stomach, and is eliminated?
18"But the things that proceed out of the mouth come from the heart, and those defile the man.
19"For out of the heart come evil thoughts, murders, adulteries, fornications, thefts, false witness, slanders.
20"These are the things which defile the man; but to eat with unwashed hands does not defile the man."
(Of course, if he believes in Judaism and doesn't accept the New Testament, this won't help at all... haha.)