OP, can I just say do not get your baby Christened if you don't believe. And don't let other people pressurize you into it if its not something you feel right. I sort of understand how you feel because we had alot of pressure and unpleasantness from my DH's family but in the opposite way you are experiencing.
My DH's family are quite forthright atheists and were fairly forceful and insistent we should have a Humanist naming ceremony for our children. When we didn't want to do that, as by that stage we were attending church, they basically put alot of pressure on and when we still didn't cave in blanked us. In fact they have blanked every single important religious ceremony within our family from our children's christening to our formal church blessing of our marriage to name a few (we were originally married in a civil service at a hotel as we weren't practicing Christians at the time). We never even bothered to tell them or invite them to my husband's Confirmation, or when years later our children were Confirmed. We knew they would not approve or agree and it would cause more unpleasantness.
So although its pressure in a different form to your family's I do understand how the expectation to conform can be quite forceful.
A Humanist ceremony didn't feel personally right to us, and we wanted to bring our children up as Christian - to us we knew that was the right thing to do. But if it doesn't feel right to you to get your children Christened then don't be forced into something you aren't comfortable with.
Alot of people seem to confuse tradition and formally naming their baby with getting them Christened in church where the parents and the god parents are making religious vows to God to bring up their child in the Christian faith.
If you aren't going to do that, and all you are doing is going through the motions of getting your family and friends together to watch your baby having his or her names read out in church followed by a big party afterwards, then frankly its pretty pointless for you, and for the church and the congregation where its happening.
I know that I'm probably going to be roasted on MN for saying all this, but unless you actually believe in Christ I can never really understand why someone would want to do that.
Don't get me wrong, I have no problem with people believing in any religion, or even in no religion at all, but as someone who isn't Muslim or Hindu for example, I personally wouldn't be turning up at a Mosque or a Temple to have my child named there, especially if I would end up making vows to bring them up in that religion. So why do that in a church?
In the same way I don't understand why someone would have a church wedding when they don't believe either. The amount of times you see couples getting married in the local church because its a picturesque photo opportunity or parents getting children baptised where they spend the whole time ignoring the ceremony and talking through it about where they are meeting up for the party afterwards - I just don't understand it. Or the other one that crops up regularly at certain times of the year - families turning up for a set number of months to services when they never go to church, simply so that they can get the vicar to sign the application form for their child to get into the Church of England secondary school. Why would you want to get your child into a faith school if you don't believe? (and yes both the local CofE primary and secondary schools openly teach about other faiths and atheism, as did I when bringing my children up as Christian).
When my husband and I got married, neither of us were church goers - so we didn't get married in church - we felt it would have been hypocritical to do so. We had a lovely civil ceremony in a local hotel. It was only when we started regularly going to church a while after having our children that we had a religious blessing for our marriage and decided to bring our children up in the Christian faith so they could be open to the possibility of God and make their own minds up later in life.
My DH's family often lectured us that we were not letting our children make their own minds up by bringing them up in a faith - any faith. But we have always been pretty open to questioning and debating the difference between 'Religion' and God, talking about all faiths and beliefs with them, not just Christianity. In contrast over the years I've noticed any questions my niece or nephew had about faith or God got pretty firmly belittled and squashed if it didn't conform to the family line.
So OP, make your own mind up. They are your children. Think about what you really feel is right and what you believe or don't believe. And don't let yourself be pushing into something just for the sake of it.