Teach children about Jesus at a young age,

[Huggy Bear]

That aside, let's cut the shit while we're at it; the Christian belief system cannot simply be boiled down to the golden rule -as if it isn't a staple in most belief systems religious or otherwise- and you are assuredly aware of that as a Christian yourself. I'm not speaking for you, but I'm giving you the benefit of the doubt.

Can you get to heaven through love for your neighbor, or do you have to wholeheartedly believe in woo while you're at it? 

Twit.

*emphasis mine*

Matthew 25
31 When the Son of man shall come in his glory, and all the holy angels with him, then shall he sit upon the throne of his glory:
32 And before him shall be gathered all nations: and he shall separate them one from another, as a shepherd divideth his sheep from the goats:
33 And he shall set the sheep on his right hand, but the goats on the left.
34 Then shall the King say unto them on his right hand, Come, ye blessed of my Father, inherit the kingdom prepared for you from the foundation of the world:
35 For I was an hungred, and ye gave me meat: I was thirsty, and ye gave me drink: I was a stranger, and ye took me in:
36 Naked, and ye clothed me: I was sick, and ye visited me: I was in prison, and ye came unto me.
37 Then shall the righteous answer him, saying, Lord, when saw we thee an hungred, and fed thee? or thirsty, and gave thee drink?
38 When saw we thee a stranger, and took thee in? or naked, and clothed thee?
39 Or when saw we thee sick, or in prison, and came unto thee?
40 And the King shall answer and say unto them, Verily I say unto you, Inasmuch as ye have done it unto one of the least of these my brethren, ye have done it unto me.
41 Then shall he say also unto them on the left hand, Depart from me, ye cursed, into everlasting fire, prepared for the devil and his angels:
42 For I was an hungred, and ye gave me no meat: I was thirsty, and ye gave me no drink:
43 I was a stranger, and ye took me not in: naked, and ye clothed me not: sick, and in prison, and ye visited me not.
44 Then shall they also answer him, saying, Lord, when saw we thee an hungred, or athirst, or a stranger, or naked, or sick, or in prison, and did not minister unto thee?
45 Then shall he answer them, saying, Verily I say unto you, Inasmuch as ye did it not to one of the least of these, ye did it not to me.
46 And these shall go away into everlasting punishment: but the righteous into life eternal.

Clearly the people in the emboldened part weren't religious, or else why are they acting surprised when they are about to be let into heaven? Now this wouldn't be the case for those that heard the gospel and rejected it, it's for those that never had the opportunity to hear the gospel yet were good people. Hence the separation of the sheep from the goats; in other words the good from the bad.

Moral of the story? Love everyone, that's the best lesson you can teach a child.

Hebrews 13
2 Do not forget to show hospitality to strangers, for by so doing some people have shown hospitality to angels without knowing it.