Having sex or not is up to you.
But I dont think is quite honest to yourself to say your christian, to say you want to save for marriage but at the same time enjoy fingering a woman.
Do things all the way. Choose.
It doesnt surprise me, how anyone that is religious and tries to tell something about their believes, the most often, not to say almost always, use the "fear" factor. eg: "be happy for not having sex because your missing out on the STD all your friends must have".
I have 28, didnt had sex till 20 with no fingering before it, because I choose to.
Enjoying anal stimulation is completly normal, human.
That doesnt define that you'r gay.
Your comment about farting just show quite easily you judge without knowing.