I've spent the past two days thinking of a way to respond to this thread that won't come across as harsh. So I'm going to hope that what I'm about to say will come across as advisory rather than as an attack.
Back in June you asked on TBT what religion you should be. When asked why you wished to subscribe to a religion you couldn't provide a solid response. Based on this, I'd suggest that perhaps you need to spend a lot more time (years perhaps) finding yourself and understanding your own beliefs before you share them with someone else. Young children are very impressionable, and if you decide a couple of years down the line that this religion isn't right for you or behave in a way that contradicts the teachings of your religion then you're going to be sending him confusing and mixed messages. While you say you were raised in a Buddhist household, you've also shared before that you now follow a different school of Buddhism which means you may not be the most informed person to be teaching your beliefs to someone else.
You should consider what you are aiming to achieve from sharing your religion with your child. Provided that you couldn't give us a solid reason for why you wished to follow a religion I'd also question your reasons for wishing to share that with someone else. You need to know what you want to achieve in order to understand the most appropriate way to introduce your child to the religion and what practices you might have them engage in (if any). There are wonderful things a child can gain from religion and most of those are linked to having a supportive network and good teacher.
In your situation specifically, I'd recommend that if you do wish to encourage your child to be religious that you seek out someone else to help and guide you. Alternatively it may be a good idea to wait until your child learns about religion in school (whether Buddhism specifically or others) and then introduce your beliefs to them and see how interested they are in engaging with it.
I was raised Christian and my faith was undermined by my parents doing a lacklustre job with it. They appeared to care more about guiding me toward a certain way of thinking rather than subscribing to it themselves. They never took me to church but I was forced to read the bible and pray daily with no real explanation as to why. I had a spiritual crisis when I was eleven after something my mother said that completely shattered everything I was raised to believe in, and I ended up identifying as an atheist throughout my teens and early twenties. I read into a lot of different religions before eventually returning to Christianity, in a different branch, and that rocky foundation I started with is still a massive obstacle in my faith. I don't think it will ever stop being one. I attend a church service every Sunday as constant affirmation otherwise I backslide and begin to go through the same ordeal all over again. So that's why, based on my experience, I don't think it's a good idea to take the lead on teaching your child a religion that you yourself are still relatively new to and may not stick with throughout the entirety of their childhood. If your faith changes, or you cannot do a good job, then you are setting that child up for a rocky relationship with religion for life.
I'm going to quote a few lines from Casting Crown's song
Love You With The Truth regarding Christianity:
It's not about religion or earning God's forgiveness
With magic prayers or new behavior
It's all about your heart, He'll meet you where you are
Turn from your sin and trust in Christ as Lord
The reason I'm sharing this is because inadequately teaching someone your beliefs can come across as too much of a focus on physical practices, rather than spirituality. You can tell a child to pray and you can convince them that your way of thinking is right—
just like you can tell them the tooth fairy is real—but you can't force them to make a spiritual connection with something.
My goal with writing this is by no means to discourage you. I think religion is a wonderful and positive thing for a child to grow up with. But you should have a good think about your reasons for wanting to introduce your child to religion, how you think it will benefit them, and to consider if you are really the best person to guide them on their spiritual journey. It's not a decision you should take lightly nor one you should allow people on the internet to make for you.
I hope this has given you something to think about and will help you in making an informed decision regardless of the eventual outcome. Good luck and congratulations on the birth of your son.