Aquinas did help scholasticism to become a big part of the west yes. He also upheld the almost augustinian view of predestination and grace and election(Plus, he said one of the most disgusting things about the afterlife that I have heard), and he therefore not only was a front figure for scholasticism, but also for the thought of Calvin. BTW, I really think he was an overrated philosopher and thinker. Immanuel Kant proved him wrong also. Yes, Aquinas is one of the philosophers who has a hand in the fact that the west is so atheistic and rationalistic today. I am certain of it. And holding him as "The philosopher of the Church" as the catholics do, don't do them any favours. A quote from Aquinas, this apparently great philosopher, theologian and saint, will do: "In the kingdom of heaven, the blessed will see the punishment of the damned, so that they will derive all the more pleasure from their heavenly bliss.” Summa theologicae, 3, Q94, article 1
Or here is another translation of the same quote: "Wherefore in order that the happiness of the saints may be more delightful to them and that they may render more copious thanks to God for it, they are allowed to see perfectly the sufferings of the damned."
Would an orthodox christian dare to say something like that? How about I quote Starets Silouan, who IMO was a real saint. The following is told by Archimandrite Sophrony on page 48 of his book, St. Silouan the Athonite:
I remember a conversation between [Silouan] and a certain hermit who declared with evident satisfaction,
‘God will punish all atheists. They will burn in everlasting fire.’
Obviously upset, Silouan said,
‘Tell me, supposing you went to paradise, and there you looked down and saw someone burning in hell-fire – would you feel happy?’
‘It can’t be helped. It would be their own fault,’ said the hermit.
Silouan answered him in a sorrowful countenance:
‘Love could not bear that,’ he said. ‘We must pray for all.’
Here is another quote by Starets Silouan:
“If the Lord saved you along with the entire multitude of your brethren, and one of the enemies of Christ and the Church remained in the outer darkness, would you not, along with all the others, set yourself to imploring the Lord to save this one unrepentant brother? If you would not beseech Him day and night, then your heart is of iron—but there is no need for iron in paradise.”
It seems to me like Aquinas and Silouan didn't really worship the same God. I prefer the God of Silouan.