You can seldom change someone with telling him, he does things wrong all the time, to tell him once is enough.
Just be yourself, yes make it clear, what you would do and not do but do most of it by just being different.
You are not resposible for your friends actions and he is no good rolemodel for you.
You showed him you are dissapointed, and that is right, because that is what you are.
But you also have to forgive yourself and him, for the things that you can not change at the moment.
Give god time and stay true to your belief.
Not everyone is in the same boat, some people are not so strong in the faith.
Just show him by example, that you are a fun godloving person, that takes her commitment to god seriously.
At some point in the future, he might say, you helped him a lot, by being there and showing him
(by example) that cheeting, lying, making fun of everything is not the only way to get recognision.
Because you are happy, even if you do not do those things.